A cave explorer on a speleothem at the first doline, or skylight, in Hang Son Doong while two other explorers illuminate a large passage leading to the second doline 1.5 kilometers away.

adventure cave crouching day distant doline elevated view exploration explorer full length getting away from it all hang en hang son doong hiking horizontal indoors moss national park nature only men phong nha ke bang physical geography quang binh rock rock formation sedimentary rock skylight speleothem three people vietnam watch out for dinosaurs