I came across this video of a Frenchman called Guillaume Nery diving in the Bahamas without any equipment. He dives into a deep underwater hole and then literally climbs back up the sides before swimming to the surface….all on one breath of air!
As a world champion freediver, Nery takes the sport to the very edges of what is possible and in this video creates an underwater version of base-jumping.
The strange arm movement propels him through the water efficiently, creating a fine balance between covering enough distance and yet maximising the oxygen his has in his body.
I’ve since discovered that he has dived to more than 100 meters without a scuba tank and on a single breath. He also doesn’t use fins!