Newly published video shows the layout of the tragic California dive boat Conception, including the lower decks where 34 people were trapped as the watercraft went up in flames.

The below decks were packed floor-to-ceiling with bed bunks stacked three on top of one another, according to the footage, posted on YouTube Monday by Sailor James, a diver who rode the boat in January 2018.

Santa Barbara County Sheriff Bill Brown said Tuesday that the 33 passengers and sole crew member sleeping below deck on the Conception had no chance, since both escape routes, a stairwell and hatch were blocked by flames.

The footage doesn’t show the two stairwells that led up to the cabin, according to James, who wrote that, “I remember being shocked that there was no accessible hatch to the deck, that I knew about anyway.”

“I am not putting blame on the dive captain or the company who runs the boat because this boat was highly professional and checked out by the Coast Guard regularly so it was obviously up to code,” he wrote in the video’s caption.

“Disasters just happen sometimes, and there is no bigger disaster on a boat than a fire.”

The ship had been on a three-day scuba diving excursion to the Channel Islands when someone aboard apparently made a mayday call around 3:14 a.m. Monday.

Emergency calls about the horrific blaze said the vessel was “fully engulfed” by fire.

Four crew members and the captain were on the top deck and leapt overboard, escaping.

The US Coast Guard has retrieved the bodies of 25 victims and announced they were suspending their search efforts for survivors.

Several more bodies — “somewhere between four and six” — have been spotted by divers but have yet to be retrieved from the 65-foot-deep ocean floor.