The ATM Cave Tour begins with a 45-minute hike through the jungle, leading to three river crossings that may require swimming or using ropes to navigate the current. Water levels are often high, so participants should expect to arrive at the cave entrance fully soaked. After gearing up with helmets and headlamps, the group enters the cave by swimming through its water-filled mouth. Over the next three hours, the tour involves climbing over rocks, swimming through large chambers, and navigating narrow passages—one famously known as “the Headlock.” This journey offers a rare and challenging glimpse into the sacred world of the ancient Maya.