NTSB preliminary report says all crewmembers were asleep during deadly California boat fire

/ CBS/AP

New details about boat fire investigation

All six crewmembers were asleep aboard a scuba diving boat off the Southern California coast when a fire broke out in the middle of the night, killing 34 people who were trapped in a bunkroom below the main deck, federal investigators announced Thursday. Boats like the Conception, which caught fire around 3 a.m. on September 2 and sank, are required to have a crewmember keep watch at night.

The National Transportation Safety Board (NTSB) has been investigating the tragedy and released a two-page preliminary report that said five crew members were sleeping in their quarters on the second deck and another below deck when the fire broke out. NTSB said the Coast Guard declared the accident a major marine casualty.

"Initial interviews of three crewmembers revealed that no mechanical or electrical issues were reported," according to NTSB. "At the time of the fire, five crewmembers were asleep in berths behind the wheelhouse, and one crewmember was asleep in the bunkroom."

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NTSB's report said "a crewmember sleeping in the wheelhouse berths was awakened by a noise and got up to investigate." That crewmember alerted the other crew and that's when the captain radioed a distress message to the Coast Guard.

The report comes as investigators seek to determine the cause and try to recover the wreckage of the Conception from the bottom of the sea amid an ongoing criminal probe conducted by the FBI, Coast Guard and the U.S. Attorney's Office. Any findings by NTSB are not law enforcement findings and the criminal probe may impact NTSB's ability to interview the remaining survivors.

A diving vessel burns off the coast of Southern California on September 2, 2019. Santa Barbara County Fire Department

Divers on Wednesday recovered the remains of the last victim — one of dozens who died of smoke inhalation as they were trapped below a raging fire.

The Coast Guard issued additional safety recommendations in the wake of the tragedy, such as limiting the unsupervised charging of lithium-ion batteries and the use of power strips and extension cords.

The recommendations also suggest owners and operators of vessels review emergency duties with the crew, identify emergency escapes, check all firefighting and lifesaving equipment onboard and look at the condition of passenger accommodation spaces for "unsafe practices or other hazardous arrangements."

Coast Guard records show the Conception passed its two most recent inspections with no safety violations. Previous customers said the company that owns the vessel, Truth Aquatics, and the captains of its three boats, were very safety conscious.

James Hall, a former NTSB chairman, told The Associated Press a preliminary report is generally a summary of the early findings that relies on interviews, inspection documents and other records and a review of current maritime rules and regulations.

Kris Van Cleave contributed to this report.

First published on September 12, 2019 / 3:40 PM

© 2019 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.

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