When elephant seals go on long dives, they can reach thousands of meters below the ocean’s surface – and the lice they carry with them can withstand the intense pressure there
Source:
https://www.newscientist.com/article/2250525-seal-lice-can-survive-the-pressure-found-4000-metres-under-the-sea/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home