Hang Son Doong is the world's largest known cave ... which soldiers fought in mud-filled trenches) — that each boast ...

The Atacama Trench, located off the coast of Peru and Chile, is one of the deepest oceanic regions on our planet, and scientists think it could be an ecological haven. A new study describes a four ...

Victor Vescovo descended nearly 11km (seven miles) to the deepest place in the ocean - the Pacific Ocean's Mariana Trench ... visit that deepest place in the world's oceans.