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

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

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