Underwater wastes absolutely no time as it forgoes backstory set up and dives right into the terror. It isn’t perfect, but it isn’t horrible either. I personally enjoyed it for what it was as it isn’t often to see films of this sub genre now days. Underwater is very reminiscent of films like DeepStar Six, and Leviathan. Which in itself is pretty self explanatory on where Underwater is likely to go critically and financially. But in time will likely find new life as a cult classic.