How do you raise ships that have been sunk in a harbor or canal?

During World War 2 the British sunk some of Italy's Battleships in Taranto Harbor and the Japanese American Battleships at Pearl Harbor.

Then there were ships sunk in the Suez canal during the 1956 Suez Crisis.
How are the ships re-floated if some have torpedo hits Taranto & Pearl Harbor, and those scuttled like those in the Suez Canal?

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