What makes a sub tick? 1945 Electric Boat Company poster

[HogHammer]

One of the many WW2 posters that I have from my late father's collection.  May post a few other items later.  Some are pretty interesting.

[Gillhunter]

I got to go aboard the Amberjack, one of the last, if not the last conventional sub in commission on her last cruise when she tied up to the Springfield. Pretty neat.