Hah, epic, just epic ^^. This the first time i opened map in pb and i was like 'wow'. That "sky" background makes for a really cool feeling when playing this map. And these crystals now look awesome too (i think, thanks jit? ^^). Great job man
Now for the other aspects of the map. I like what you did with base, but i still feel like main (the sand place in front of base) is too empty. Maybe adding some fully rusted barrels might not break the feeling but still work? Dunno, try to think about something
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As for the base, i think that color-marking area where cap is would be good idea. I usually expect cap to work on colored material where flag is, not before it.
The cave (part of map which is colored purple) is pretty decent, but if he think about gameplay, with decent recon, going into any of the smaller caves(cave-tunnel) or going out of them would be just death wish. 1 line is enough to cover whole 1 small cave-tunnel. Making the top of the cave area accessible and adding ladder to midhigh so you can get on 'roof', might just fix that issue. You could get to the 'roof' even now, but you get stuck because of low sky.
Now as a final part, lets talk about a logic of this map. Right now, even tho it looks rly cool, the map doesn't make much sense. I guess it should be underwater map as the title says, but whats holding the water back from collapsing all over the map?
I could think of 2 solutions to this, either add light blue fog so it gets the feeling of being underwater, but still keeping all the physics. Or add some glass structure around the map.
