At the same time, a sea wave surged, and seawater started to flow into the opening vent that automatically closed to prevent flooding. There was no single device on the submarine to detect low oxygen level and the crew suffocated due to the diesel engines consuming all the oxygen present within the submarine. As a consequence, the Commander and the Political Commissar of the People's Liberation Army Navy were dismissed from service, as well as the Commander, Political Commissar and Chief of Staff of the Northern Fleet.