If you guys wanna read up on a couple books on submarines, I can highly recommend two:
Blind Man's Bluff - The Untold Story of American Submarine Espionage, by Sherry Sontag and Christopher Drew
Red Star Rogue, by Kenneth Sewell and Clint Richmond
Though I cannot speak to confirm or deny any actual specifics as to submarine performance characteristics, or the details of any similar missions I've may or may not have personally been on, these books are very excellent reads. They require no prior familiarity with submarines in order to read and understand.
Also, if you were scared, or otherwise think that the world came close to nuclear war during the Cuban Missile Crisis of 1962, then you probably don't want to read Red Star Rogue, the events of which took place in 1968.
BUT, to keep this on track with the site moderators, I'll talk a wee bit about guns again:
Once upon a time, I was qualified as an MCI...Military Customs Inspector. I went to the school for this so that we would have a couple MCI's aboard during a Mediterranean deployment. MCI's are responsible for educating the crew on the customs requirements as well as processing all customs paperwork and performing required customs inspections.
The importance of this is that, when a ship returns from deployment which involved port calls in foreign countries, it has to clear customs BEFORE the crew is allowed to leave the ship. Even to bring on shore power, it turns out.
So the MCI will handle all the paperwork, ensure any required inspections are performed, and that the ship and crew is otherwise ready to clear customs upon return to port.
Anyway, I found out that it was possible to purchase and import firearms from overseas...and had a discussion with the Commanding Officer with respect to this, because several of us were interested. It requires certain paperwork to be completed, and, of course, there were limitations on the types of firearms. Can't import fully automatic weapons, for example. And the weapons would have to be secured aboard the ship in a place, and by a means, that the CO would approve of until reaching home port. These weapons would remain on the ship upon return to port until the actual paperwork was processed and approved by customs ashore.
If it wasn't approved, for whatever reason...then the weapon would have to be turned over to customs for disposal...meaning to-bad, so-sad, you just lost your money.
Unfortunately, despite all the preparations...not a one of us actually found anything we wanted in the ports we visited.
I was intersted in a Dessert Eagle when we visited Israel, but never got around to finding any place I could purchase one. (sigh)