Two men have escaped injury after a jet-ski sank in Botany Bay, Westpac Life Saver Rescue Helicopters say.
The men were riding the jet-ski about 200 metres off Lady Robinson Beach in Sans Souci just before 2pm when they appeared to get into trouble, Westpac Life Saver said in a statement.
Police and emergency services, including Westpac Life Saver Rescue Helicopters, tried to search for the men but they were able to swim to the Kyeemagh Swimming Enclosure nets and then onshore without the need for assistance, Westpac Life Saver said.
The men were not injured and did not need to be taken to hospital, a NSW Ambulance spokesman said.
"It appears the jet-ski might have sunk in deep water quite some distance offshore," Westpac Life Saver's chief executive Stephen Leahy said in the statement, adding that his organisation could not find the jet-ski.
Mr Leahy said the rescue effort was difficult to co-ordinate as the jet-ski had sunk near Sydney Airport.
"For us to get to the scene, we had to cross directly through the normal flight path of incoming aircraft who were only moments from landing. Air traffic controllers were very helpful and we were able to fly directly behind a landing Qantas Airbus A330," he said.