Giant caves beneath sinkhole reveal origin of mystery trenches that score Australia's Nullarbor Plain

When giant systems of ancient caves far below the surface of Australia collapsed, it left distinctive clues at the surface.

By Chris Simms Edited by Hannah Osborne , Laura Mondrag n Published 22 September 2026 In News When you purchase through links on our site, we may earn an affiliate commission. Here's how it works .

A sinkhole is seen in Australia's Nullarbor Plain. (Image credit: Matej Lipar) Copy link Facebook X Reddit Pinterest Flipboard Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter Mysterious trenches stretching for miles across the vast Nullarbor Plain in Australia are the surface scars of huge ancient caves collapsing deep underground, according to new research.