Scientists on Southtow analyzed dead bottom-dwelling fish that they found floating on the sea surface. This one is a cusk eel (Porogadus sp.) and is 41.5 cm (about 17 inches) long. The fish were found in an area where scientists had detected a swarm of seafloor micro-earthquakes (and where hydrothermal vents were discovered five years later). In retrospect, the scientists concluded that the quake activity indicated a seafloor eruption, and the fish were killed by a powerful force that ruptured their swim bladders. (Photo by Philip Hastings, Scripps Institution of Oceanography)