[PogySailor]

The green area you are looking at is just painted metal plating and structure supporting the sonar dome and spherical array. Also the front of the #1 main ballast tank.

[stylin_geek]

In looking at the pic, it appears the pressure hull might have been damaged. It appears there is a slight bulge just behind the painted metal plating. I know the external plating and pressure hull are separate, but I'm thinking the sub compressed slightly on impact, causing the bulge that is visible.