(ATM) Tour is for the fit and adventurous. This is hands down the most talked about cave in Belize. Discovered in 1989 and open to the general public since 1998, the ATM cave is a full five kilometers deep. After a 45 minute hike in the cool tropical rainforest and across three streams you enter its hourglass-shaped mouth for a 10 meters swim in water at most 5 meters deep, to land on a rock shelf. The next 600+ meters is a journey of well over a half hour filled with many sharp & slippery edges, water depth alternates from just covering your toes to portions where only the tallest won’t need to swim. Along the way you pass many calcite formations, a few which have undergone minor sculpting (purpose unknown), by the Maya. After this distance, you ascend 2 or 3 meters to a shelf above the river. From this point forward is shallow ground, where you walk barefoot (with socks only).