Castellana caves (Castellana Grotte), Apulia, Italy, Europe

Speleologist in the Krizna Jama Cave, Cross Cave, Grahovo, Slovenia, Europe

Sardinia. Baunei. Su Meraculu cave

Sardinia. Baunei. Mangalistru cave.

Sardinia. Baunei. Su Meraculu cave

Cave explorers add scale to a cave in Mulu National Park

A cave explorer poses in a tube in a cave in Mulu National Park

A cave explorer admires pretty cave formations in Mulu National Park.

A cave explorer reaches the top of a waterfall underground in New Britain

Two female cavers exploring a cave ice-plug, Crowsnest pass alberta canada

Male caver climbing a rope to exit a cave, Crowsnest pass alberta canada

Tek (Trimix) speleologist diver in a karstic underwater cave over 70 meters deep, Photogrammetry, twiglight zone, Mayotte

Cave diver in a karst underwater cave at a depth of 60 metres for the Gumbo La Baharini 2 expedition, Passe Bateau Sud at a depth of 60 metres, Mayotte

Cave diver in an underwater cave of karstic origin at a depth of 75 meters during the Gumbo La Baharini 2 expedition, which aimed to produce a complete 3D model of this karstic cave using photogrammetry. Passe Bateau Sud, Mayotte lagoon

Speleologist diver taking photographs in a karstic cave at Passe Bateau Sud at a depth of 60 metres, Mayotte

Potholing diver in a karstic cave at Passe Bateau Sud, 60 metres deep in Mayotte's lagoon.

Tek rebreather diver at a depth of 70 meters with a DPV specially equipped with 60,000 lumen lighting and 12 Gopro to carry out a 3D survey of a karstic cave submerged for over 14,000 years, Passe Bateau Sud, Mayotte Lagoon

Concretions in the caves of Choranche, cave remarkably rich in fistuleuses, fine stalagmites that can reach several meters long, Massif du Vercors, Isere, France

Concretions in the caves of Choranche, cave remarkably rich in fistuleuses, fine stalagmites that can reach several meters long, Massif du Vercors, Isere, France

Underwater cave from Misool, Raja Ampat, Indon?sie