Gathering from what I have read, this is very plausible.
Props to you for either playing, or having a wonderful imagination.
If I had a guess, It either occurs around a 115 accident, or, if you are familiar with single player, the underwater levels near the end of the game.
As it is title ascension, it could be where the old transmission station is (underwater, where the cuban boat is), and you are underwater, with zombies, and must ascend your way to the surface. Just a theory.
And for those speaking of the lighthouse map, its been around for quite some time. Its a PC mod, and there is gameplay on youtube w/ myoelectric playing. Its interesting, and huge, but nothing to do with black ops.