[Calvin Locke]

...in recent years as many as 100 pigeons have been nesting in the submarine, causing extensive corrosive damage.

Among other sources of corrosion.

Although, I'm surprised that a non battle-tested end-of-WWII era vessel is getting this type of "historic" attention.

[MasterGunner01]

Too bad the Royal Navy did not preserve one of their T-class WW2 subs. Some 53 were built for the RN beginning with HMS TRITON in 1934. The T-boats were the rough RN equivalents to the WW2 USN Gato, Balao, and Tench class subs (234 built). Sadly, they're all cut up for razor blades.