BY size and shape, I think those are two views of Triton SSN/SSRN 586--in two different locations. Have a look at Navsource

[link=http://www.navsource.org/archives/08/08586.htm]Triton on Navsource[/link]http://www.navsource.org/archives/08/08586.htm

Triton was the only two-reactor US submarine, built in the 50's as a "radar picket" to watch for Soviet missile launches. With those two reactors (I forget why), she was 450 feet long, biggest sub ever in our fleet--except the ballistic missile subs. For comparison the other sub nearby is probably 250 - 300 feet long, so it's about the right size...gotta be the 586, only one built that long with a sharp-end hull.

Wonder how old the photos are--Navsource says Triton's most recent inspection date was late 2007. Can't believe she's still around. (?)