Ships at the bottom of Ocean and rate of rusting

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Ships at the bottom of Ocean and rate of rusting
So I have to ask, deeper down they are, do they rust slower?

Would things like weapons in the ships of WW2 wreaks will be salvageable if they were at the bottom of the pacific?

Old Lugers in U-boats off the shores of the East Coast?

If so is it because of the cold temp, lack of oxygen in the water, ?