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Report: Severe winds led to capsizing of Seacor Power

Christian Fernsby |
Severe winds during a thunderstorm led to a loss of stability and ultimately the capsizing of the liftboat Seacor Power, the National Transportation Safety Board said last week during a public board meeting.

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Of the 19 people aboard the vessel, six died and seven are missing, presumed dead. Six people were rescued by the U.S. Coast Guard and other vessels. The Seacor Power, valued at $25 million, was a total loss.

On April 13, 2021, the Seacor Power, a liftboat supporting offshore work on oil-producing platforms, capsized off the coast of Port Fourchon, Louisiana. Vessel operators reported heavy rain, winds exceeding 80 knots and 2- to 4-foot seas at the time of the capsizing.

​The Seacor Power was destined for an oil and gas lease block in the Gulf of Mexico and got underway shortly after noon. Sometime after 3 p.m., the Seacor Power was overtaken by a rain squall. The vessel’s mate said a second squall about 10 minutes later caused “white out” conditions.

The crew began to lower the vessel’s 265-foot-long legs to the seafloor to allow the vessel to ride out the storm. During the leg-lowering process, the mate turned the Seacor Power into the wind to slow its speed. As the vessel turned, it heeled over and capsized at around 3:57 p.m.

A National Weather Service report concluded the area of the capsizing was affected by an “unusually intense thunderstorm wind event.”

The NTSB determined the probable cause of the capsizing of the Seacor Power was a loss of stability that occurred when the vessel was struck by severe thunderstorm winds, which exceeded the vessel’s operational wind speed limits.

Contributing to the loss of life on the vessel were the speed at which the vessel capsized and the angle at which it came to rest, which made egress difficult and the high winds and seas in the aftermath of the capsizing, which hampered rescue efforts.

NTSB investigators identified data gaps that prevented the National Weather Service from identifying and forecasting the surface wind magnitudes that the Seacor Power encountered. The localized wind conditions could not be detected by weather service radars due to their elevation angles.

As a result, the NTSB recommended the National Weather Service, Federal Aviation Administration, and the Air Force work together to assess coastal weather radar sites to determine if it is safe and appropriate to lower radar angles, which could improve the ability to accurately forecast weather conditions.

The NTSB issued three safety recommendations to the U.S. Coast Guard: develop procedures to inform mariners in affected areas whenever there is an outage at a navigational telex broadcasting site; modify restricted-service liftboat stability regulations to require greater stability for newly constructed restricted-service liftboats; and develop procedures to integrate commercial, municipal, and non-profit air rescue providers into Sectors’ and Districts’ mass rescue operations plans.

The NTSB also reiterated a recommendation to the U.S. Coast Guard to require all personnel employed on vessels in coastal, Great Lakes and ocean service be provided with a personal locator beacon. The NTSB also recommended the Offshore Marine Service Association notify members of personal locator beacons’ availability and value.

“We’ve been waiting five years for the Coast Guard to implement our recommendation on personal locator beacons — a call to action we’re renewing today for the fourth time,” said NTSB Chair Jennifer Homendy.

“Mariners’ safety can’t wait, which is why I’m urging employers to invest in personal locator beacons for their crew. As the Seacor Power tragedy shows, the lifesaving promise of these devices cannot be overstated.”

The first time the NTSB recommended the Coast Guard require personal locator beacons was following the 2015 sinking of the cargo vessel El Faro in which all 33 crewmembers perished.

NTSB reiterated the recommendation for the first time after the fishing vessel Scandies Rose sank off Sutwik Island, Alaska, in 2019, which killed five people; and again following the 2020 sinking of the Emmy Rose fishing vessel off the coast of Massachusetts, which killed all four crewmembers.

“None of the people aboard the El Faro, the Scandies Rose, the Emmy Rose, or the Seacor Power had personal locator beacons. If they did, perhaps more of them would be with us today,” Homendy said. “Instead, 55 people died or were unrecovered in these tragedies — 55 people gone forever.”


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