[@Rain], I was thinking of it being pretty much as the game is. The two characters wake up, they happen to board the same escape pod, and whilst down on the surface of the oceanic planet they have to use the advanced technology to build a seabase as well as explore the depths of the planet. Romance would come into play; they are stuck together and have to live eachother, whether they like eachother from the start or they didn't like eachother before they both got into the same escape pod. Action would come in the way of the creatures of the depths: What happens when a Reaper Leviathan decides to give the base a few nudges? I guess for it the people inside are just tinned meat.