On 21 September 2007 Dave set a new world record in Dynamic apnea breaking the old record by 1 m, creating a new world record of 226 m in a time of 3:38. The old record of 225 m was held by Stig Severinsen. On 23 September 2007 Dave broke his own record by 18 m setting a new world record of 244 m in a time of 4:02.
In August 2008 Dave equalled the world record for Dynamic No Fins, which he hold until September 2010 jointly with Tom Sietas of Germany at 213m. Then, on Monday 27 September 2010 Mullins executed a clean DNF swim of 218 meters on a single breath to stake his claim as the sole world record holder. Dave's record-setting 218m DNF dive took 4 minutes and 11 seconds. Dave also holds the New Zealand national record in this discipline at 232m (it's his personal best, though not registered as a world record).
On 10 September 2008 during the Sharm 2008 Freediving World championships, Dave once again broke his own Dynamic world record and set the new WR at 248m. This has since been surpassed by Alexey Molchanov of Russia, who held the record at 250m. Mullins surpassed this with a 265-meter swim while holding his breath for 4:01 on 25 September 2010.
Dave has also set the New Zealand record in the Constant Weight discipline, diving to 108m in April 2008 at the Vertical Blue Invitational, Long Island, Bahamas.
- Francesca Koe (25 September 2010). "3rd Times a Charm for Kiwi Freediver".
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