Many of the 39 people aboard the 75-foot Conception were thought to be sleeping below deck when the fire broke out about 3:14 a.m. Monday.
It sank in 64 feet of water as firefighters were battling the blaze. Only five people were rescued.
RELATED: Presumed death toll reaches 34 as search suspended for survivors of boat fire near Santa Cruz Island
Here is the dramatic mayday call from the Conception.
Coast Guard: "What is your position and number of persons on board Over."
Vessel: "Twenty-nine. Twenty-nine POB. I can't breathe!"
From this point, only the Coast Guard broadcasts can be heard, not the responses.
Coast Guard: "Your vessel is on fire is that correct?"
Coast Guard: "Roger, that is 33 people onboard the vessel that's on fire that can't get off?"
Coast Guard: "Roger, are they locked inside the boat?"
Coast Guard: "Can you get back onboard and unlock the boat? Unlock the doors so they can get off?"
Coast Guard: "Roger, you don't have any firefighter gear there, no fire extinguishers or anything?"
Coast Guard:"Roger, is this the captain of the Conception?"
Coast Guard: "Was that all the crew that jumped off?"
Coast Guard: "Roger, and there's no escape hatch for any of the people on board?"