how long can a river otter stay under water
North American river otter Prey is captured with a quick lunge from ambush, or more rarely, after a sustained chase. River otters can remain underwater for nearly 4 minutes, swim at speeds approaching 11 km/h (6.8 mph), dive to depths nearing 20 m (22 yd), and travel up to 400 m (440 yd) while underwater. Several river otters may even cooperate while fishing. Small fish are eaten at the surface, but larger ones are taken to the shore to be consumed. Live fish are typically eaten from the head.
Stig Severinsen Combining yoga and his knowledge of physiology in freediving, Severinsen became a record holder of four AIDA freediving world records. He achieved two Guinness World Records in 2010: in March that year he swam 236 feet (72 meters) under ice wearing only swimming trunks and goggles, exceeding Wim Hof's record of March 2000 by 47.6 feet (14.5 meters); and in April, after inhaling pure oxygen, he held his breath for 20 minutes and 10 seconds in a tank full of sharks at the Kattegat Centre in Grenaa.[3] In May 2012 he was awarded the record of "Longest time breath held voluntarily (male)" by Guinness World Records for holding his breath for 22 minutes;[4] this record was achieved in a tank at the London School of Diving with the water cooled to 30 °F (-1 °C).[5] In April 2013 in Qorlortoq Lake in east Greenland, he set two new world records for "longest swim underwater - breath held": 500 feet (152.4 meters) while wearing a wetsuit and monofin, taking 2 minutes, 11 seconds,[6][7][8] and the following day, 250 feet (76.2 meters) wearing only swimming trunks.[9][10] He announced that these would be his last record attempts and he would now concentrate on teaching.[2]