It would be interesting to know just what threat these subs might pose meanwhile I will keep in mind that a North Korean submarine infiltrated a joint US ROK exercise in shallow water sinking a ROK ship then got clean away without being detected, or so we are told.
Pig boat comes to mind, I took a tour of one of the last built after the Nautilus was built and compaired to the SSN boats was interesting to say the least.
Difference was room, say you and 40 of your in laws had to spend every day for 3 months locked inside a Motel 6 with all windows boarded up no phones, one TV that only had a DVD player and a library of 20 movies, with the fire alarm going off and on 3 times a day but you could not get out of the room. Kitchenette the size of a small travel trailer and a 6 small man table to eat on at one time, and next to the table on the wall the tube of perhaps water with a bubble of air to tell you is you were going up or down. A cup of coffee will tell you the same just watch if the liquid moves up or down.
We used to have Family Cruises on the SSN's as the Pig Boats could not hold anymore then the crew and a small rat that would become the crews pet. Problem for anyone that had a beer gut as the inside halls were tummy to tummy walking past each other.
I do not know how anything was ever stored on the Diesal boats, on the SSN's I was curious about a small door overhead of the galley, opened it and there was a roil of toilet paper and some kind of pipe with a valve to it going off to where ever. Not one inch of space was wasted.
The old timers that earned their Dolphins on the Diesels back in the late 1950's and early 1960 tell of stretching a cord from one bulkhead to the next as tight as they could and as they descended the cord would shrink inward as the boat descended deeper, pressure on the hull, Subs seldom explode they implode.
As a kid waiting for my Dads ASR to come into port occasionally a Diesel would tie up to the peer and liberty was called. WOW, the crew were a scurvy lot, smelled to high heaven of Diesel fuel, only sailors I had seen wearing beards and some put in their Liberty pierced gold earring. Most went to take a 30 minute hot shower, shave, and find cloths that they had in lockers in the barricks. Then on to the Salads, cold fresh Milk, what ever before they hit the bars.
For a little girl this was seeing daring pirates on the high see, WOW, not just me, the sailors watching from the skimmers watched and shook their heads. Crazy Bastards was heard more then once coming from the on lookers.
I went on to marry not one but two of these Sub Sailors, Crazy dudes, both Qualified on the diesel boats and went Nuke. One passed away, the other still living and still reliving the good old days. 4 kids from 2 men that were extraordinary in every way, this is no life for a Pussey or faint of heart, this life separates the grown men from the grown/ man boys.