gj laerth that is really good mate
The outside is pretty much perfect I think, really doesn't need much else at all. Although the T-spawn needs a bit of something, even just a truck or something behind the fence would do it.
Inside is all very well built like the outside, but it looks a little to similar throughout. The textures and all look good, but I think it just needs breaking up a little bit so there are some more distinct seperate areas inside. Maybe have a deeper delve into the props folder and see what you can dig up. I'm sure de_nuke would have some models that would work well in this one.
Also the wall lights inside look odd with HDR on. There a very clear light spots on the walls. I would replace those with directed spotlights to fix that (like the inside lights on sdk_cbble.vmf).
Soundscapes could do with being a bit richer, maybe some ambient city sound or something. And also I think some far detail in the sea skybox would be nice, a distant island or boat or something.
I hope I don't sound to negative or anything, cos honestly, as the map is, its very, very good.