Four tourists were trapped for about two hours in darkness inside the Cango Caves near Oudtshoorn in the Western Cape, the South African Broadcasting Corporation (SABC) reported on Sunday.
The four were separated from their group and were told by their guide to follow the lights to the exit, a Cape Town resident told the SABC.
When the cave lights went out, the group was unable to find its way out.
A Cape Town woman was able to call the police using her cellphone. They were rescued by cave staff about an hour-and-a-half after the phone call.
Southern Cape police and Cango Caves management were not immediately available for comment.
On New Year’s Day, rescuers battled for 10 hours to free an overweight woman who became stuck in a narrow passage in the caves.
The extensive Cango Caves are among South Africa’s most popular tourist attractions, known for its spectacular limestone formations. About a quarter of the 4km cave network, which was discovered in 1780, is open to guided tours.