Those aircraft carriers are very large. It will take quite a bit of time and resources to salvage it. They are also almost unsinkable. Even if you wanted to sink one on purpose, you would have to work very hard at it and in the end, you might still not be successful.
From what I have heard from sailors is the Sinkin Sarah was fairly easy to sink. Son served 6 month tour on Forrestal, lovely knows as the USS Zippo.