Actual companies start to make supercavitating rounds with multi-environment ( air to water, water to air ). Real supercavitating rounds seem to be more powerfull than ingame.
Watch all videos, there's many applications:
http://m.youtube.com/watch?v=2xbIaCZNv30
http://m.youtube.com/watch?v=YKMWuMRwyCk
http://m.youtube.com/watch?v=_t2Sz-8YCzQ
http://m.youtube.com/watch?v=0I9uu9jm56A
http://m.youtube.com/watch?v=jnR1rcvku4c
More infos about MEA.
http://www.dtic.mil/ndia/2012armaments/Wednesday14038morgan.pdf