The tunnel is the oldest cave system in Western Australia. It became famous in the late 1800s. The trail is about 2km return and you need to be surefooted to negotiate rocky uneven surfaces. In the dark, your torch may light up small bats roosting on cave walls and glowing freshwater crocodile eyes. It can be a little unnerving for some. I opted to keep my feet dry, but 3 of my party took on the crocs and waded through to the end
