What kind of idiot would permit themselves to be locked in below deck?
Not sure, supposedly the door was a watertight type presumably designed to prevent deck splash from getting below deck. This is atrocious
But aren't those doors usually openable from both sides?
They have a locking mechanism to assure a tight seal, but I have to assume the mechanism has a handle/wheel on both sides.
You are correct. My guess is that this was a fishing trawler conversion not designed for passengers
You mindless twit, these are not "converted fishing trawlers":
You know nothing, you are ignorant, you lack the even the slightest bit of intellectual curiosity that would lead you to doing just a little bit of research. Sensationalism of tragedy is your currency, ignorance is your stock in trade.