That was on the call audio. Don't know what they meant, was the forward hatch locked or something.
I read that when the people on deck woke up, they ran to the hatch also to open it...but it was fully engulfed in flames. By the time the crew woke up, probably a lot of the people on the lower deck were dead or beyond rescuing. It must have been fast, because anybody who could have gotten to the hatch could have gotten out easily. (Unless the hatch really was locked, so that needs checking.)
It seems that it may have started in the galley and spread out on either side, because they had charging stations in the galley and probably somebody’s lithium battery exploded or overheated and set fire to something nearby. People charge their professional-level video cameras there, and some of these have bigger batteries.
Some boats only let people charge batteries at stations on the deck. Bet that’s going to be a law soon.
“Locked” or “blocked”? Could have been either.