Stalin to US Navy: All your captured subs are belong to us!

US Navy to Stalin: U no can haz!

Stalin to US Navy: Ur treety, let me show u it!

US Navy to Stalin: Captured subs? What captured subs?

That's pretty much how it went down in 1946, and now someone has found one of the subs in question. These aren't war memorials, but I'll bet their sunk too deep to be considered for salvage or preservation.