While I can see the value in exploring and preserving historically significant sunken ships such as the USS Monitor or the CSS Hunley, is there that much to be gained by exploring these submarines that are presumably well documented in their construction? These are war graves and should just be left in peace.
That has not been proven yet. These subs were found all in close proximity to each other and were likely scuttled by the British. Or even the Germans. I'd wager there are no remains of a single body on any of the subs.