In 1991 Michael Proudfoot was investigating a sunken naval cruiser around Baja California, Mexico, when he accidentally smashed his scuba regulator and lost all his air. Luckily he found a big bubble of air trapped in the sunken ship's galley as well as a tea urn almost full of fresh water. By rationing the water, breathing shallowly, and eating sea urchins he managed to stay alive for two days before being rescued. Well done sir.