The <a href="https://en.wikipedia.org/wiki/Soviet_submarine_S-80" id="mw0w" rel="mw:WikiLink" title="Soviet submarine S-80">Soviet submarine S-80</a> sinks when its <a href="https://en.wikipedia.org/wiki/Submarine_snorkel" id="mw1A" rel="mw:WikiLink" title="Submarine snorkel">snorkel</a> malfunctions, flooding the boat.