Danger from the deep (aka dangerdeep) is a Free / Open Source World War II german submarine simulation. It is currently available for x86-32/64 Linux, Windows, OSX, and FreeBSD, but since it uses SDL/OpenGL it should be portable to other operating systems or platforms. This game is planned as tactical simulation and will be as realistic as our time and knowledge of physics allows. It's current state is ALPHA, but it is playable. Here is an ebuild for it. I tested it on amd64 too, but under this architecture the game crashes when loading missions, so I only put the ~x86 keyword in the ebuild.
Created attachment 84797 [details] dangerdeep-0.1.1.ebuild
Created attachment 84798 [details] files/dangerdeep-destdirs.patch
reattach over there please. *** This bug has been marked as a duplicate of 130023 ***