Who was the first person to deep sea dive?

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.