This six-million-year-old cave was discovered by famed British subterranean explorer Andy Eavis, 68, in Sarawak last month, and he named it "Conviction Cave" for good reason. It had taken him 24 expeditions since 1977 to make the find. The "virgin cave" - previously untouched by humans - is located 15km from the Gunung Mulu National Park headquarters and could be among the 15 largest in the world.