Maria Soledad Leonardi’s do the job once in a while commences by wrestling with 100-kilogram (220-pound) pups of southern elephant seals. These mammals can dive down 2,000 meters (1.25 miles). At this depth, the water tension is 200 situations atmospheric force. She scientific studies these animals in lookup of tiny lice that piggyback on them. Those people seal lice can endure crushing pressures far too, Leonardi and her colleagues now report.