Hidden Caves Found Beneath Australia's Nullarbor Could Guide Search for Life on Mars

Scientists found that shallow trenches on Australia's Nullarbor Plain mark buried caves slowly collapsing upward over millions of years. The method could help locate hidden caves on Mars, where they might shelter future human explorers.

• Trenches up to 20 km long trace caves collapsing upward
• The Nullarbor covers over 200,000 sq km of limestone
• Karst landscapes supply water to 10–25% of the world's population
• Martian caves could shield future bases from radiation