further entry of air into compartment 6 out of the high-pressure air system due to incorrect actions taken by the submarine 's command led to development of the fire and the increase in temperature in the compartment to 800-900ëc -lrb- according to calculations -rrb- at a compartment pressure of 13 kg /cm -lsb- . sup -rsb- 2 -lsb- / -rsb- .