I can just add some personal experience to this.
For eight years I was Curator/Director of Operations for the Arkansas Inland Maritime Museum (AIMM) in North Little Rock, Arkansas. AIMM is home to the historic submarine USS Razorback (SS-394). From 1970 until 2001, Razorback served in the Turkish Navy as TCG Murat Reis (S-36). When AIMM got ready to tow Razorback back from Turkey, one ironclad requirement was that her two propellers had to be removed, in Turkey.
Divers actually cut one prop off with a saw. They had trouble cutting the other one off and gave up about halfway through. A Turkish UDT team actually used it as a training exercise, diving at night, placing plastic explosives and shearing the shaft in two the next morning, once a crane had been rigged...
The two props are on display today...
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