Rescuers descend to the entrance of Morca Cave as they take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

U.S. caver Mark Dickey, on a stretcher, is carried out of the Morca cave as his rescue operation comes to a successful end near Anamur in Mersin province, southern Turkey September 12, 2023. REUTERS/Umit Bektas

Rescuers arrive at a base camp to take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground in Morca Cave, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

A rescuer descends to the entrance of Morca Cave as he takes part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

The base camp of international rescuers is seen near the Morca Cave as a rescue operation continues to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

Rescuers walk to the entrance of Morca Cave as they take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 10, 2023. REUTERS/Umit Bektas

Rescuers descend to the entrance of Morca Cave as they take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 10, 2023. REUTERS/Umit Bektas

U.S. caver Mark Dickey, on a stretcher, talks to reporters as his rescue operation comes to a successful end near Anamur in Mersin province, southern Turkey September 12, 2023. REUTERS/Umit Bektas

Rescuers work at the entrance of Morca Cave as they take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

U.S. caver Mark Dickey, on a stretcher, is carried out of the Morca cave as his rescue operation comes to a successful end near Anamur in Mersin province, southern Turkey September 12, 2023. REUTERS/Umit Bektas

A rescuer holds a map of the Morca Cave during a meeting as a rescue operation continues to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

Rescuers arrive at a base camp to take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground in Morca Cave, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

Turkish and Bulgarian rescuers stand at the entrance of Morca Cave as they take part in a rescue operation to reach U.S. caver Mark Dickey who fell ill and became trapped some 1,000 meters (3,280 ft) underground, near Anamur in Mersin province, southern Turkey September 8, 2023. REUTERS/Umit Bektas

U.S. caver Mark Dickey, on a stretcher, is carried out of the Morca cave as his rescue operation comes to a successful end near Anamur in Mersin province, southern Turkey September 12, 2023. REUTERS/Umit Bektas