11915 kg, if I'm not wrong - 12 tons.
I don't know if these numbers are correct.
BUT: today technologies of food preservation are much more developed. We crio-treat food, make powder edible after adding water and such miracles, that were rather not widely used during WW2. I think it is quite possible that their food was heavier - held in cans (thicker than ours), wet (preserved in varous kinds of fluids rather than by drying/vacuuming).
Also note that they needed to carry fresh water supply for whole their trip (sic!), while modern subs just "make" fresh water. Thist must have weighted additional tons.
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