Seed and example locations I've run into a few caves where I move to a new room and in the 'doorway' area, I am suddenly hovering over a pool of water. Lacking the ability to swim, I drown. The game puts me back at the point I entered the room at, which is the exact same point I just drowned at. Here's a picture. It's... quite annoying, to say the least.
This is a bug in an area I've been working on for the next update. I'll fix it. Thanks for the bug report.