World's largest tube cave in Mexico

A 370m deep cave in Mexico attracts many adventurers around the world to come here to discover every year.

With a width of 60m and a depth of 370m, El Sostano de las Golondrinas (Chim Yen cave) is considered the largest tube cave in the world.

In December 1967, this place was first discovered by an expedition consisting of three Americans.Since then, this natural wonder attracts thousands of adventurers as well as climbers around the world every year.

Experts believe that this place was formed after the arch of an underground cave collapsed, then affected by water erosion along the fault line in limestone.

According to the researchers, this is the ideal place for many birds.Birds often live in holes in the walls of the cave.However, the number of birds living here is decreasing over the years due to climbing activities and cave discoveries.

Local authorities said they would tighten control and limit these activities to ensure habitat for species.

The white flock of white-tailed macaws and oats often hover around the mouth many times before flying into the forest.This is also the origin of this cave name.

The surface of the cave is home to many plants.Layers of rock and bird droppings are usually snakes, centipedes, scorpions, insects .