It's actually an interesting thought. Living humans can acclimate to almost any pressure if they do it slowly. Of course you need a working circulatory system for it to work. Vampires don't have that so they would be limited to the first couple hundred feet. Then there's all the things in the sea that eat dead flesh which is just about everything.
Interestingly, the vampires from Twilight actually come pretty close to this. Especially in Midnight Sun, and The Short Second Life of Bree Tanner, you see them basically just being "people" with supernatural abilities.
Things like, speed reading bookstores at a time, playing mega 8 board chess (and cheating with foresight), going on a "hiking" trip to the other side of the continent, etc.
The underwater thing comes up as well, but only in the context of using it to throw off trackers, or as a simple obstacle (see: the english channel).
Things like, speed reading bookstores at a time, playing mega 8 board chess (and cheating with foresight), going on a "hiking" trip to the other side of the continent, etc.
The underwater thing comes up as well, but only in the context of using it to throw off trackers, or as a simple obstacle (see: the english channel).