Santa Barbara County Sheriff Bill Brown says police have interviewed the men but didn't disclose what they said. No cause for the fire has been identified and Brown says at this stage there's no reason to believe it involved a criminal act.
The Latest: Surviving crew from boat fire talk to police
Sheriff Brown speculated that oxygen or propane tanks could have exploded during the fire, but there was no sign this sparked the blaze.
"Nothing in the [mayday] broadcast from the vessel... indicated there was an initial explosion," he said.
Eight confirmed dead in California boat fire
James Kohl, brother of one of the missing passengers, told KTLA TV in Los Angeles he was told there was a propane gas explosion on board but Rochester said she could not confirm that.
Eight dead from California dive boat fire
The crew, some only in underwear and two with leg injuries, had retrieved a dinghy and paddled 200 yards to the Hansens' boat.
Shirley Hansen said the men were distraught -- one had a girlfriend below-deck on the Conception -- and two of the men paddled back to look for survivors, but found none.
Eight dead, 26 missing as dive boat sinks in flames off California
The Coast Guard and National Transportation Safety Board have not identified where the blaze began. Aside from gas kitchen appliances, other potential sources of ignition include the oxygen tanks used to fill divers' personal supplies or the diesel fuel used to power the boat.
Greg Ricketts, a former manager with the Federal Aviation Administration and experienced open-water diver, tells USA TODAY he suspects the cause of the disaster was a "galley fire, making it impossible for the crew to reach the guests and the guests unable to evacuate."
A bunk layout map on the Truth Aquatics website shows only one staircase leads from the boat's sleeping compartments up to deck, and it is near the galley. If the fire began there, it may have blocked passengers from reaching the deck.
California dive-boat fire highlights need for more than one exit from sleeping quarters