Cave explorers have traversed what’s now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-metre-deep cave, which they named Delta Variant, in Tasmania’s ...

Cave explorers have traversed what's now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-meter-deep cave, which they named Delta Variant, in Tasmania's ...

Caves don’t appear suddenly, and they aren’t carved by violence. They form quietly, over immense stretches of time. This video explains how water, rock, and patience shape massive underground systems.