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Originally Posted by seafarer
I'd imagine that, unless the sea bottom was iron rocks, a big long steel tube would make a pretty stark sonar return relative to a muddy sea floor. Metal objects show up really well in bottom scanning active sonar, in my limited experience with it anyway.
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S-36 grounded on at least three separate occassions...and it worked every time.
http://en.wikipedia.org/wiki/USS_S-38_(SS-143)
http://www.hazegray.org/danfs/submar/ss143.txt
World War II navies didn't have bottom scanning sonar.