the fire and gas contamination of the compartments were caused by the failure of the submarine 's command to fulfill the requirements of articles 89 and 121 , and the failure of the personnel to fulfill articles 90 and 91 of the rbzh-pl-82 regarding sealing off compartments , disconnecting high-pressure air and hydraulic system pipelines passing through the distressed compartment , and bleeding air reserves overboard from the damaged cofferdam no. 4 of the high- pressure air system .