The ship had to be raised, even if there was no Byzanium on board.
Some people watching the movie and even characters in the movie say that the ship was raised for nothing because the Byzanium mineral was not on board after being raised. Time, money and lives were lost in this effort to have the mineral before the Soviets get it. But the one thing that mostly everyone forgets is the postcard found in Arthur Brewsters bag in the holding cell. So in essence the ship would have had to be raised after all because without the postcard it would not have given the clue where the Byzanium is buried in Southby.
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