Josh Bratchley had been exploring a flooded cave in Jackson County, Tennessee, with a group of divers from the United Kingdom when he failed to return to the surface at around 3pm local time on Tuesday.
A search and rescue operation involving emergency services and expert divers from the USA is now underway after his group raised the alarm in the early hours of Wednesday morning. Authorities said he was successfully rescued around an hour later. "After the diver was rescued and brought out of the water, he stated that he was fine".
Mr Bratchley, a former member of the Devon Cave Rescue Organisation, was checked over by medics who found he was "stable" and he declined further treatment.
Despite the traumatic experience, British Cave Rescue Council's Vice Chairman Bill Whitehouse told the news outlet that the diver is now in "good health and good spirits".
It was then confirmed that Josh had been rescued from the flooded cave.
Most people he rescues are in a state of panic, but Bratchley was as "calm as could be", thanking his rescuers as he emerged, Sorenson said.
Josh Bratchley was rescued just before 7 p.m.at the Mill Pond Cave in Gainesboro.
When the tourists returned from a dive around 3 p.m. Tuesday, they could not account for one of the members of their group.
Bratchley was reported missing inside the Mill Pond Cave at 1:17 a.m. Wednesday.
Nine months have passed since a team of divers helped 12 young Thai soccer players out of a cave in which they were trapped for almost three weeks.