The official world record is held by Nuno Gomez (South Africa) who recorded a dive to 1,076 feet in 2005.
Unofficially, most people accept that Pascal Bernabe (France) actually accomplished a slightly deeper dive (1,089 feet) later in 2005, but Bernabe's dive was not accepted by the Guiness Book of World Records for reasons that are unclear.
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Nuno Gomes, SA, holds the 2010 Guinness deep dive using Scuba World Record. Gomes dived to a depth of 1,044 feet (318.25 m) in the Red sea in June 2005. His total dive time was 12 hours 20 min. To combat the effects of oxygen and nitrogen narcosis his tanks were filled with 'trimix'; a combination of oxygen, nitrogen and helium, in specific ratios.