Psysics Problem. fluids, please help!?

Question

In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long, thin reed. Assuming the maximum pressure difference his lungs can manage and still breathe is -83 mm Hg, calculate the deepest he could have been.

this is still not the correct answer....I am getting something similar, but it is not correct for some reason...any other suggestions?

Answer 1

83*13.6 = 1,169.6 mm H20 = 3 ft . 10 in. (he WAS British, after all)