The last ship we hit on our Philly trip was the USS Becuna. She is a Paleo class sub that served in WWII and on into the late sixties. This ship is only open to guided tours, so pay attention to the schedule before you go. We did not and missed the last tour on Thursday!
It is a simple tour, as you just go from bow to stern through all the compartments. Just beware, the compartment door ways are very tight to get through! If you are OK climbing around (which I always am), its a great tour.
- Manteuffel