If you ever been to the beach and tried to dig a hole into waterlogged sand you will appreciate how much you need to move in order to get a little bit deeper. Just for scale this ship is 26 containers long (a picture posted showed one jackknifed c-can trailer blocking 4 lanes of traffic) 10 trailers wide and 12-20 trailers deep. And to compound this the ship has taken on water so the superstructure has been weakened so the whole thing can collapse like a deck of cards and create even more of a cleanup if the dredging is unbalanced. Here is a link of how they got the sunk then grounded ships out of Pearl Harbor:
Tldr; they did not finish until 1944.
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