pressure began to rise in compartment 5 . lieutenant a. v. zaytsev -lrb- supplement to explanatory report -rrb- : `` monitoring air pressure in the submarine 's compartments , at the moment the fire began at the `` korund '' control console i noticed an insignificant rise in pressure in compartment 5 , on the order of 0.5 kg /cm -lsb- . sup -rsb- 2 -lsb- / -rsb- . ''