Free diving has a current world record of around 214 m straight down—that’s greater than the height of 50-storey building. When Alexander the Great was attacking the city of Tyre in 332 BC, the city sent free divers to cut the anchor cables of Alexander’s ships. And for thousands of years free divers would collect salvage from shipwrecks to build underwater barricades against invaders.

Read more here:: What the body does when free diving