A search for a man missing off the NSW far south coast has so far uncovered no sign of the 42-year-old swimmer.
The Victorian man went for a run followed by a swim at the isolated Gillards Beach in the Mimosa Rocks National Park, near Tathra, on Wednesday.
Emergency workers were called about 5.30pm after the man didn't return from his swim and his twin brother found his belongings on the beach.
A search involving water police, State Emergency Service volunteers, surf lifesavers and the police helicopter has so far failed to find any trace of him but authorities have not given up hope.
"We can't discount anything," Chief Inspector Peter Volf told ABC Radio on Thursday.
"We know he did go for a swim at some stage but whether he went back in the water, we can't establish that, he was here on his own."
The search was called off on Wednesday night but resumed on Thursday morning.
Volunteer surf lifesavers are assisting and the Westpac Life Saver Rescue Helicopter is conducting an offshore search.
"Weather conditions at the time the man went missing were fine with a slight northerly breeze and moderate sea-swells," Surf Life Saving NSW said in a release.
A spokesman said the search will continue on Friday if authorities have still not found the man.