Longest underwater relay swim [24 hours]
Last updated: August 27, 2017 at 21:25 pm
In October 1987, six Czech swimmers swam a combined distance of 151.99 km (94.44 miles) in an Olomouc swimming pool.
SOURCE:
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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.