Jacking up a vessel.
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Previously:
https://www.homemadetools.net/forum/...955#post111992
https://www.homemadetools.net/forum/...706#post111347
https://www.homemadetools.net/forum/...299#post110063
Salvaging a 50,000 ton ship by cutting it into pieces
https://www.homemadetools.net/forum/...8241#post87066