Underwater swimming (scuba) - distance in 24 hours

Paul Cryne (GB) and Samir Sawan al Awami (Qatar) swam 78.92 km (49.04 miles) in a 24 hour period from Doha, Qatar to Umm Said and back on 21-22 February 1985 using SCUBA equipment.

They were swimming underwater for 95.5 per cent of the time.