NOAA's Response and Restoration Blog

An inside look at the science of cleaning up and fixing the mess of marine pollution


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NOAA Lifts 14 Metric Tons of Fishing Nets and Plastics from Hawaiian Coral Reefs

NOAA Fisheries Biologist Matthew Parry also contributed to this post.

Lost or discarded fishing nets frequently get lodged on corals and smother or break the corals underneath them. Here, a diver removes them from a reef near Midway Atoll in the Northwestern Hawaiian Islands. (NOAA)

Lost or discarded fishing nets frequently get lodged on corals and smother or break the corals underneath them. Here, a diver removes them from a reef near Midway Atoll in the Northwestern Hawaiian Islands. (NOAA)

The sea life around Hawaii’s remote Midway Atoll is swimming easier after NOAA recently removed 14 metric tons of debris from its waters (A metric ton equals about 2,204 pounds.). The removal team, consisting of members of the NOAA Coral Reef Ecosystem Division, spent 19 days collecting debris both from along the shoreline and in the water around Midway Atoll in the Northwestern Hawaiian Islands. As usual, the bulk of the items recovered were abandoned fishing gear and plastics.

During the 2013 cruise, the NOAA team discovered and hauled away a 23-foot-long boat that was confirmed to have been washed away from Japan during the 2011 earthquake and tsunami. (NOAA)

During the 2013 cruise, the NOAA team discovered and hauled away a 23-foot-long boat that was confirmed to have been washed away from Japan during the 2011 earthquake and tsunami. (NOAA)

Notably, the team also removed a 23-foot-long derelict vessel weighing close to three-quarters of a metric ton. This vessel was confirmed as having been lost from Japan during the 2011 earthquake and resulting tsunami. (Learn more about marine debris from the tsunami.)

This current round of marine debris removal efforts began in 2011 when a plan was put in place to help restore the environment injured after the research ship M/V Casitas ran aground on the coral reefs of Pearl and Hermes Atoll in 2005. This atoll is located in the Northwestern Hawaiian Islands in what is now the Papahanaumokuakea Marine National Monument. Our office, along with our partners, undertook a Natural Resource Damage Assessment for this ship grounding. This process resulted in a legal settlement which provided NOAA with funds to conduct marine debris removal projects over several summers, starting in 2011. The 2011 efforts removed 15 metric tons of marine debris while the 2012 cruise brought in 52 metric tons. Since 2011, NOAA has collected a total of 81 metric tons or 178,000 pounds of debris from the Northwestern Hawaiian Islands.

The 2013 NOAA team collected 14 metric tons of fishing gear, plastic, and other debris from the shoreline and waters around Midway Atoll. (NOAA)

The 2013 NOAA team collected 14 metric tons of fishing gear, plastic, and other debris from the shoreline and waters around Midway Atoll. (NOAA)

Marine debris, particularly discarded and lost fishing gear, is a substantial source of coral damage in the Papahanaumokuakea Marine National Monument. Fishing nets frequently get lodged on corals and smother or break the corals underneath them. NOAA and our partners determined that removing nets from coral reefs in this area would prevent similar injuries to corals as those that occurred during the M/V Casitas grounding and subsequent response.

Learn more about efforts to restore coral reefs after this ship grounding [PDF].


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Removal Operations Continue for Navy Mine Ship on Philippine Coral Reef

USS Guardian salvage operations

Aerial view of the vessels aiding in the dismantling process of the mine countermeasures ship Ex-Guardian, which ran aground on the Tubbataha Reef Jan. 17. The U.S. Navy continues to work in close cooperation with the Philippine authorities to safely dismantle Guardian from the reef while minimizing environmental effects. (U.S. Navy/Anderson Bomjardim)

You may recall that in January the Navy mine countermeasures ship USS Guardian ran aground on a coral reef in the Philippines, inside Tubbataha Reefs Natural Park. The Navy removed the approximately 15,000 gallons of fuel aboard the ship and decided that the safest way to extract the Guardian from the reef was to deconstruct and carry it away in smaller sections.

Here are some interesting photos showing how the removal of the grounded “Ex-Guardian” (formerly USS Guardian) is progressing.

First, the superstructure (Wheelhouse and above deck structures) was removed as you can see in the top photo. Now the hull is being cut into sections and removed. Earlier this week the bow section, weighing approximately 250 tons, was lifted off the reef and placed onto an awaiting barge (bottom photo).

A crane vessel removes the bow of the mine countermeasure ship Ex-Guardian.

A crane vessel removes the bow of the mine countermeasure ship Ex-Guardian, which ran aground on the Tubbataha Reef, Jan. 17. The U.S. Navy and contracted salvage teams continue damage assessments and the removal of equipment and parts to prepare the grounded ship to be safely dismantled and removed from Tubbataha Reef. (U.S. Navy/Kelby Sanders)

The U.S. Navy has been working closely with the Philippine Coast Guard, Philippine Navy, and Tubbataha Reefs Natural Park during the process.

For more information on the removal operations, check out http://www.cpf.navy.mil/news.aspx/010081

You can also find out more about how NOAA works to protect and restore coral reefs after ship groundings in some of our previous blog posts:


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From Dynamite to Deconstruction, or How to Remove Ships from Coral Reefs

USS Guardian grounded on coral reef with tug removing fuel and wastewater.

SULU SEA (Jan. 28, 2013) The U.S. Navy contracted Malaysian tug Vos Apollo removes petroleum-based products and human wastewater from the mine countermeasure ship USS Guardian (MCM 5), which ran aground on the Tubbataha Reef in the Sulu Sea on Jan. 17. No fuel has leaked since the grounding and all of the approximately 15,000 gallons on board Guardian was safely transferred to Vos Apollo during two days of controlled de-fueling operations on Jan. 24 and Jan. 25. The grounding and subsequent heavy waves hitting Guardian have caused severe damage, leading the Navy to determine the 23-year old ship is beyond economical repair and is a complete loss. With the deteriorating integrity of the ship, the weight involved, and where it has grounded on the reef, dismantling the ship in sections is the only supportable salvage option. Since Guardian’s grounding, the Navy has been working meticulously to salvage any reusable equipment, retrieve the crew’s personal effects, and remove any potentially harmful materials. The U.S. Navy continues to work in close cooperation with the Philippine Coast Guard and Navy to safely dismantle Guardian from the reef while minimizing environmental effects. (U.S. Navy)

On January 17, 2013, the Navy mine countermeasures ship USS Guardian ran aground on a coral reef in the Philippines. Salvage experts evaluated various options for removing the ship, including towing or pulling it off the reef, but concluded that such efforts would cause even more damage  to the reef and the ship’s hull. Earlier this month, the Navy decided to dismantle the ship and remove it in smaller sections in order to minimize damage to the reef and surrounding marine environment.

The Tubbataha Reef, where the ship grounded in the Sulu Sea, is a marine park and UNESCO World Heritage Site, recognized for its biodiversity, pristine reefs, and protected nesting habitat for marine birds and sea turtles.

The photos of the stranded ship and the concern about the corals in this part of the world reminded me of a story about the old U.S. Coast and Geodetic Survey (USC&GS) vessel Fathomer.  The USC&GS mission was to survey the U.S. coastline and create nautical charts of the coast to help increase maritime safety. Today, this part of NOAA is called the Office of Coast Survey, which produces navigational products, data, and services to keep maritime commerce moving and to protect life and property at sea. (Editor’s note: You can check out their WordPress blog at http://noaacoastsurvey.wordpress.com.)

I came across old photos of the Fathomer when I was working on a project studying the impact of vessel groundings on corals.  That story ended quite differently than the USS Guardian, and shows how environmental protection has become a much bigger concern for salvors.  In the old days, the focus of salvage was strictly to save the ship and cargo, but modern salvors (salvage crews) have a much bigger emphasis on protecting the environment.

On August 15, 1936, the Fathomer dragged anchor in a typhoon and, like the USS Guardian, ended up grounded on a coral reef in the Philippine Islands[1].  At that time, the Philippines were a commonwealth of the United States, and the Fathomer was surveying and charting the islands.

The NOAA ship Fathomer aground on a coral reef in the Philippines after the typhoon of August 15, 1936.

The NOAA ship Fathomer aground on a coral reef in the Philippines after the typhoon of August 15, 1936. (NOAA)

The story of the Fathomer’s grounding and salvage is a good sea story, complete with rum.  All of the crew survived the storm and grounding, but the official history mentions that “Everyone was bruised and suffering from exhaustion and exposure. Two quarts of brandy, stored in the sick bay, were rationed out to all hands, and undoubtedly resulted in no one developing a severe cold or pneumonia.” The entire crew was later commended for their “seamanship, courage and fortitude.”

But what I found most interesting was the salvage efforts.  Buried in the official history are some details that show that coral reef protection was not a concern in 1936.  For example, a pile driver was used to place a “cluster of piles driven on the reef,” and these pilings were “backed by three anchors imbedded in the reef.”  Wire ropes were then used to try to bring the Fathomer upright and haul it off the reef, but those efforts were unsuccessful and ultimately the reef was dynamited and the loose coral was dredged, allowing the Fathomer to be towed to deeper water.

The removal of the USS Guardian is ongoing, but thankfully, it is clear, almost 80 years later, that coral reef protection will be very high on the list of priorities.


[1] The Fathomer worked in the Philippines from 1905-1941. After the 1936 typhoon, Fathomer resumed survey duties in the Philippine Islands. During World War II the ship was used in the defense of the Philippines and was lost in April 1942 when the American and Filipino defenders surrendered the Bataan Peninsula.


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With Tropical Storm Isaac’s Passing, Crews Resume Cutting Apart Grounded Ship and Protecting Coral at Mona Island, Puerto Rico

Response barges are anchored near the grounded M/V Jireh.

August 20, 2012 — Response barges are anchored near the M/V Jireh (foreground), which grounded on coral reefs in June. (U.S. Coast Guard/Jaclyn Young)

With the passage of the Tropical Storm formerly known as Hurricane Isaac, salvage crews and coral ecologists are once again back on Mona Island, Puerto Rico, working to remove the grounded freighter M/V Jireh while also protecting the island’s corals.

In previous ship salvage cases involving coral habitats, biologists have observed considerable coral damage from not only the physical placement of anchors, cables, and support vessels, but also continued shifting and grinding from the grounded vessel. As a result, crews are working carefully to keep that from happening here.

In such a long and complicated salvage project, it is impossible to prevent all impacts, but crews are continuing to remove and reattach corals at risk from the grounded ship. Nearly 1,000 corals have been moved already. These transplanted corals are expected to have a high survival rate and reduce the overall impacts from the vessel removal operation.

A NOAA-authorized biologist is on site during all coral relocation operations to make sure corals are properly handled and reattached to reefs. Before responders attempt to refloat the vessel, qualified divers will evaluate the corals in the area and determine an exit path for the damaged ship that will have the least impact to the surrounding coral habitat. This may or may not turn out to be the same path the ship took when it entered the reef. Depending on conditions after the vessel’s removal, the coral colonies may be relocated back to their original place on the reef.

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The U.S. Coast Guard and the rest of the response crew have been working carefully to cut up portions of the ship, in order to lighten the vessel enough to refloat and remove it from the reef. Once disassembled, the removed portions of the ship are loaded onto a barge and taken to Puerto Rico for recycling.

Additionally, since the grounding on June 21, crews already have removed 600 tons of oiled cargo and more than 5,000 gallons of oil-water mixture.

Here you can see their plan for removing and disposing of this damaged vessel.

Jireh removal and disposal process.

Jireh removal and disposal process. (Jireh Grounding Unified Command)

Once the ship is refloated, the plan is to scuttle (purposefully sink) the wreck 12 miles away from Mona Island. After it is sunk, the wreckage is not expected to pose any additional risk to corals or other marine life. The difference with this shipwreck is the location.

“Intertidal wrecks are unstable and scour the reefs as they degrade and fall apart, while a wreck far out at sea becomes a stable deep-water habitat over time,” said Doug Helton, Incident Operations Coordinator for the Office of Response and Restoration.

The Coast Guard reports that removing the Jireh from Mona Island is the best solution to protect the sensitive environment and coral reefs surrounding this highly valuable natural reserve. Once this threat is permanently removed, NOAA divers will conduct an assessment of the grounding area and continue to work with local environmental agencies to ensure its full recovery.


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NOAA Hauls 50 Metric Tons of Debris out of Hawaiian Waters

Scientists load onto a small boat marine debris collected at Midway Atoll in Papahānaumokuākea Marine National Monument.

Scientists load onto a small boat marine debris collected at Midway Atoll in Papahānaumokuākea Marine National Monument. (NOAA)

With their eyes on the ocean, a team of 17 NOAA scientists recently removed nearly 50 metric tons of marine debris—mostly abandoned fishing nets and plastics—from the turquoise waters of Papahānaumokuākea Marine National Monument in the Northwestern Hawaiian Islands.

Part of an annual effort to restore the area’s coral ecosystems, this latest sweep of marine debris also scanned for items which might have been carried there from the 2011 Japan tsunami. However, nothing could be linked directly to the tragedy.

“While we did not find debris with an obvious connection to last year’s tsunami, this mission was a great opportunity to leverage activities that had already been planned and see what we might find,” said Carey Morishige, Pacific Islands regional coordinator for the NOAA Marine Debris Program, part of the Office of Response and Restoration. “It’s also an important reminder that marine debris is an everyday problem, especially here in the Pacific.”

NOAA divers cut a Hawaiian green sea turtle free from a derelict fishing net during a recent mission to collect marine debris in the Northwestern Hawaiian Islands.

NOAA divers cut a Hawaiian green sea turtle free from a derelict fishing net during a recent mission to collect marine debris in the Northwestern Hawaiian Islands. (NOAA)

Through NOAA’s Damage Assessment, Restoration, and Remediation Program, the Office of Response and Restoration is helping restore coral reefs here after the M/V Casitas grounded on Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in July 2005. Part of the funding for the marine debris removal survey comes from the legal settlement for the Casitas ship grounding, as well as from the NOAA Marine Debris Program and Papahānaumokuākea Marine National Monument.

This recurring issue of marine debris threatens Hawaiian monk seals, sea turtles and other marine life in the coral reef ecosystems of the Northwestern Hawaiian Islands.  The scientists on this mission loaded the massive amounts of collected debris on to the 224-ft. NOAA Ship Oscar Elton Sette.

NOAA collected nearly 50 metric tons of marine debris, piled on ship's deck.

NOAA collected nearly 50 metric tons of marine debris, shown here with researchers sitting on top of the piles of nets aboard the ship Oscar Elton Sette during a July 2012 survey in the Northwestern Hawaiian Islands. (NOAA)

“What surprises us is that after many years of marine debris removal in Papahānaumokuākea and more than 700 metric tons of debris later, we are still collecting a significant amount of derelict fishing gear from the shallow coral reefs and shorelines,” said Kyle Koyanagi, marine debris operations manager at NOAA Fisheries’ Pacific Islands Fisheries Science Center and chief scientist for the mission. “The ship was at maximum capacity and we did not have any space for more debris.”

This year, marine debris was collected from waters and shorelines around the islands and atolls of the Northwestern Hawaiian Islands: Kure Atoll, Midway Atoll, Pearl and Hermes Atoll, Lisianski Island and Laysan Island.

Marine debris removed during this project will be used to create electricity through Hawaii’s Nets to Energy Program, a public-private partnership. Since 2002, it has collected and converted more than 730 metric tons of abandoned fishing gear into electricity—enough to power nearly 350 Hawaii homes for a year.


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Saving Coral After a Ship Grounds on a Reef in Puerto Rico

A ship run aground on coral reef in Puerto Rico is surrounded by protective oil boom.

The ship M/V Jireh, run aground on coral reef in Puerto Rico, is surrounded by protective oil boom. Credit: U.S. Fish and Wildlife Service.

Late last week a small freighter, the M/V Jireh, ran aground on Mona Island, an uninhabited island off Puerto Rico. The 22-square-mile island, an ecological reserve, is about 41 miles west of the main island of Puerto Rico. NOAA, U.S. Fish and Wildlife Service, Commonwealth of Puerto Rico, and U.S. Coast Guard are focusing on recovering the fuel and oil on board the freighter to minimize the environmental impact.

Efforts are underway to remove about 2,000 gallons of fuel oil from the Jireh. So far it looks like a major oil spill has been averted, but there is concern about the physical impact of the ship itself. As the ship plowed into the reef, it crushed and toppled corals. Unless restored, these unstable and barren areas may take generations to recover as tiny young coral larvae struggle to find a stable place to attach to the reef. Scientists are currently conducting a survey to see how much coral the ship affected.

[UPDATE JUNE 28, 2012: After surveying the underwater area around the grounded vessel, NOAA divers concluded that the ship caused minimal impact to coral. As of June 27, they were assessing whether any coral colonies or endangered species 300 feet out from the ship might be in its path as salvage teams attempted to refloat and remove it. NOAA would proactively remove and transplant any vulnerable species before salvage operations began.

Response crews have confirmed the Jireh is sound enough for them to go ahead and remove the diesel on board. They have deployed 100 feet of containment boom around the smaller response vessel ready to receive the fuel pumped off the Jireh. They also are removing a variety of oiled cargo from the ship, including mangoes, water bottles, cinder blocks, grain, bags of horse feed, and carbonated drinks.]

An injury doesn’t only stem from the grounded vessel. Anchors for the protective boom meant to contain any spilled oil have to be placed carefully to prevent additional damage, and care needs to be taken when the salvage tugs start to rig their own anchors and cables. About 800 feet of oil boom is currently strung around the vessel.

Some emergency actions can be taken to restore the coral reef, but recovery will still be slow. My office works to minimize those environmental impacts and develop restoration alternatives. If you are interested in other photos showing how we address coral injuries, take a look at the Maitland, Fla., and Cape Flattery, Hawaii, cases.

Mona Island is uninhabited, but there is a lot of shipping traffic nearby, and it has been affected by other ship groundings. In July 1997, the 325-foot container ship Fortuna Reefer ran aground on the south shore of the island, damaging approximately 6.8 acres of coral habitat. In September 1997, NOAA initiated an emergency restoration to the reef dominated by elkhorn coral (Acropora palmata) that was completed by mid-October 1997.


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In Case of Offshore Oil Drilling in Cuba and the Bahamas

Map of potential oil producing areas in the North Cuban Basin.

Potential oil producing areas in the North Cuban Basin. (U.S. Geological Survey)

For the past year, we at NOAA and the U.S. Coast Guard have been studying the possible threats that new offshore oil drilling activity near the Florida Straits and the Bahamas pose to Florida.

For example, the proximity of Cuba’s oil fields to U.S. waters has raised a lot of concerns about what would happen if a spill like the 2010 Deepwater Horizon/BP oil well blowout happened. If a large oil spill did occur in the waters northwest of Cuba, currents in the Florida Straits could carry the oil to U.S. waters and coastal areas in Florida. However, a number of factors, like winds or currents, would determine where any oil slicks might go.

NOAA’s National Ocean Service has more information about how we’re preparing for worst-case scenarios there:

The study focuses on modeling the movement of oil in water to predict where, when, and how oil might reach U.S. shores given a spill in this region of the ocean.

Models help to determine the threat to our coasts from a potential spill by accounting for many different variables, such as the weathering processes of evaporation, dispersion, photo-oxidation, and biodegradation – all of which reduce the amount of oil in the water over time.

Currents and winds also play a role in determining where oil will move in water. For example, there are three major currents that would dominate movement of spilled oil near the Florida Straits: Loop Current, Florida Current, and the Gulf Stream.

A diver explores coral in the Florida Keys National Marine Sanctuary.

A diver explores coral in the Florida Keys National Marine Sanctuary. (NOAA)

If oil did reach U.S. waters, marine and coastal resources in southern Florida could be at risk, including coral reefs and the Florida Keys National Marine Sanctuary, located north of the Cuban drilling sites.

We’ll be watching the drilling activity there very carefully. If a spill does happen, NOAA will be ready to share our scientific expertise on oil spill response with the U.S. Coast Guard.


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Getting Shipwrecked at the 2011 International Oil Spill Conference

In getting ready to lead a discussion on shipwrecks and marine pollution at the 2011 International Oil Spill Conference, I took a look at some past cases in Oregon, where the conference is taking place. (You can browse through historical incidents at http://www.incidentnews.gov/.)

The Oregon coast and Columbia River have claimed many ships over the years. One of the most memorable in recent years was the grounding of the 640-foot freighter New Carissa off Coos Bay, Ore., in 1999.

The New Carissa is a long sea story, involving a dark and stormy night, a heroic rescue of the crew, explosives, burning fuel, the ship breaking in two, failed salvage attempts, and a U.S. Navy submarine having to fire a torpedo to scuttle the bow section of the ship. I was there when the ship was intentionally blown-up and burned. It was startling to see the smoldering wreckage in the surf.

The grounded ship New Carissa on fire off the coast of Oregon in 1999.

A grounded New Carissa on fire near Coos Bay, Ore., Feb. 12, 1999. The ship's remaining fuel was intentionally ignited to help prevent nearly 400,000 gallons of oil from reaching the shoreline. Credit: U.S. Coast Guard

The stern section of the New Carissa remained stranded on the Oregon shore for over nine years until it was cut apart and removed from the beach in 2008.

NOAA scientists collecting water samples near the site of the grounded New Carissa in 1999.

NOAA scientists collecting water samples near the site of the grounded New Carissa in 1999. Credit: NOAA

A more recent pollution concern for that region comes from the SS Davy Crockett, a World War II Liberty ship built in 1942. This 431-foot ship was converted to a barge and then abandoned and beached along the Washington shore of the Columbia River. Earlier this year the ship began to leak oil, and the U.S. Coast Guard is conducting a cleanup.

The Davy Crockett being dismantled in 2011.

The Davy Crockett being dismantled in 2011. The wreck is surrounded by a steel cofferdam to keep oil from spilling into the river. Credit: U.S. Coast Guard

Unfortunately there are a lot of abandoned and derelict (neglected) vessels in our coastal waters, and many contain oil and hazardous materials. At the conference this week I am chairing a discussion on these kinds of sunken wrecks. NOAA’s interests in shipwrecks come from its roles as a scientific adviser to the U.S. Coast Guard, as a manager of living marine and cultural resources, and as the nation’s chart-maker to ensure that wrecks are properly marked on maps for safe navigation.

I have been working on shipwreck issues since I got involved with a project in American Samoa. In the early 1990s, a typhoon hit the island and grounded nine fishing vessels. The owners abandoned them on the reef. NOAA worked with the Coast Guard to remove the wrecks and restore the coral reef.

NOAA staff transplanting corals away from the wreck in American Samoa prior to bringing in salvage equipment in 2000.

Here we are transplanting corals away from the wreck in American Samoa prior to bringing in salvage equipment in 2000. Credit: NOAA

Since then, I have been engaged in a number of shipwreck projects. Currently, I am working with NOAA’s Office of National Marine Sanctuaries to figure out which of the approximately 30,000 ships wrecked in US waters might pose pollution threats. Most date back to World War I or earlier and did not carry oil as fuel or cargo.

Some of the more recent wrecks, however, are known to be substantially intact and based on accident investigation reports and cargo records, have the potential to contain oil. This is an issue around the world, and one of the presentations during my conference session will be from an Italian researcher looking at wrecks in the Mediterranean Sea. I’m looking forward to hearing how other countries are addressing the same issue.


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When Coral Reefs Lose a Boxing Match

This past Sunday, the one to really get knocked out during Filipino Manny Pacquiao and American Shane Mosley’s boxing match was an area of coral reef in the southern Philippines. There, international media report that a Panamanian-registered cargo ship bearing 65,000 tons of coal from Australia to India ran aground in the Sarangani Bay, crushing a large section of reef. According to Philippine news sources, local officials have started rumors that the M/V Double Prosperity’s mostly Filipino crew was deviating from course into shallow waters to get better satellite signal and TV reception of that day’s boxing match between Pacquiao and Mosley.

“I have a feeling they sailed close to the shore to watch the fight,” Sarangani Governor Miguel Dominguez speculated to the media a few days after the incident.

While the damaged corals, located in a marine sanctuary, were supposed to be protected, perhaps they should have learned to bob and weave after witnessing another coral reef’s bad luck.

MV Shen Neng grounded and spilling fuel oil on the Great Barrier Reef in April 2010

M/V Shen Neng 1 grounded and spilling fuel oil on the Great Barrier Reef in April 2010. The milky plume in the water is pulverized coral. Photo courtesy of Maritime Safety Queensland.

Last April, the Great Barrier Reef received an even worse black eye when another ship carrying Australian coal, the Chinese M/V Shen Neng 1, grounded itself on the famous reef, spilling between three and four tons of heavy fuel oil and oiling nearly two-thirds of a mile of Queensland shoreline. The main cause of the Shen Neng 1’s grounding wasn’t a crew of boxing fans, but rather, an overly sleepy pilot, which is reported to be a key safety risk at sea.

When something like this happens in U.S. waters, Office of Response and Restoration (OR&R) staff are called in to figure out how coral reefs have been damaged and to make science-based recommendations for restoring that habitat. For both of the cases mentioned here, the real threat to the environment wasn’t from potentially spilling the ships’ fuel; it was from smashing the sensitive coral reefs below the surface.

As the ships plow into the reefs, they create what is known as a “grounding scar,” that in the case of the Shen Neng 1, was several miles long and crushed hundreds of acres of corals.  The milky white sediment plume you can see around the vessel in the above photo is pulverized coral. In addition to corals being directly toppled and crushed, the resulting rubble can continue to scour and smother the adjacent undamaged corals, delivering a double blow to the ecosystem.

For example, in the center of the below photo, you can see a debris pile composed of crushed coral. The left side of the photo shows undamaged coral reef, and the barren area to the right reveals the improvised highway the vessel scraped across the reef.  These unstable and barren areas may take generations to recover as baby corals lack a stable place to attach to and form a new reef.

Coral reef damaged by the Margara oil tanker grounding in Puerto Rico in April 2006

Coral reef damaged (right) by the Margara oil tanker grounding in Puerto Rico in April 2006. Credit: NOAA

Once a ship is stranded, the damage to corals is not over. Other concerns include scraping toxic paint from the ship’s bottom, discharging ballast water and cargo to lighten the ship, and additional reef-crushing as the swells and wind move the ship and as salvage vessels work to free the stricken vessel. In some cases, even the iron from the ship can harm the reef.

The bottom line is that sometimes an oil spill is only one of many environmental problems that can result from a shipping accident. Some things can be done to restore the reef, but recovery will still be slow. OR&R works to minimize those environmental impacts and develop restoration alternatives.  If you’re interested in how OR&R and NOAA address coral injuries, take a closer look at these two cases in Maitland, Fla., and Cape Flattery, Hawaii.  And if you’re a boxing champ, we know a couple coral reefs that could use some lessons in defense.

Doug Helton contributed to this post.

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