Basically, I took some things from HL2, and smashed them together with a little bit of Team Fortress 2. I haven't been able to play multi-player with it yet, so I don't know about any bugs. Feedback appreciated.

Forget about the 'haven' part. I'm still working on a name. About the underwater piece... The water isn't actually there... yet. Any pieces where you can see through is water, and I'm still going through the knicks and knacks of making it underwater. The concept is there though.