Crampton, a champion swimmer who had just arrived from Wellington, said it appeared they were practising some kind of free diving technique.
“It looked like they knew what they were doing so I let them be for a little bit and did a couple of lengths.
“Then, they were still down there not moving, at which point the lifeguard was a bit concerned as well.
“So, I swam down to see if they were responsive and they weren’t, so I pulled them both up and they weren’t talking or breathing very well.”
Crampton said he was “a little bit in shock” after the incident.
“Fortunately, there were a couple of doctors poolside… so they helped out with the lifeguards.
“It wasn’t nice, pulling a limp body up from the bottom of the pool. I’m glad I was there and able to do it.
“Another 20-30 seconds and they probably wouldn’t have made it.”
The Olympic Pools confirmed to Newshub an incident had taken place and all their procedures had been followed.
Newshub.