Last updated: March 3, 2018 at 5:56 am
7,600 m (24,928 ft) — In 1956, Jacques-Yves Cousteau’s Calypso was anchored over the Romanche Gap off the west coast of Africa using a 318 kg (700 lbs) anchor, 30 m (100 ft) of heavy chain, a 250 kg (550 lbs) pig iron, a 61 m (200 ft) steel cable and a quarter-inch braided nylon line 9,997 m (32,800 ft) long.
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Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.