Having just returned from a trip to Socorro on the Nautilus Explorer, I have re-evaluated my choice of cabin for the next trip. My room was below deck and the escape hatch was just outside my door. The stairwell down the hall was an open exit to the dive deck. There is no door to go through. I don't know how much strength is required to lift the hatch or if you press a button and it opens automatically. We were told there was a 24-hr roving watchman/woman, but unless I roamed the ship during the night, I wouldn't know to what extent roving would be. I will pay the extra fee to have a room on the upper deck for a better chance of survival should I need to make a quick exit. In the grand scheme of risk/benefit analysis, I'm probably more likely to have an in-water or onboard injury or accident than having to bail from the ship, so this is not a big concern for me.
I am now making it a conscious practice to not leave my devices charging in my cabin when I'm not there and completely unplug my surge protection plug extender when I'm sleeping. I always travel with a portable flashlight for the bedside, whether I'm in a hotel or on a boat, in case of emergency.
Having said all that, live-aboard diving is not my favorite, but I use it as a means to get to a destination otherwise unreachable by day boat, such as Socorro or Guadalupe. As a single traveler, I pay a ridiculous single penalty for my own room. For the high cost per day to live in cramped quarters, even in my own room, it's not a great option for a vacation experience. On a one to five star rating, my last live-aboard experience was a two out of five stars, but the dive experience on that same live-aboard was five stars. Before I go veer off on another tangent, I'll leave it at that.