A team of divers have discovered what is believed to be the biggest flooded cave on the planet in eastern Mexico.

By connecting two underwater caverns, the Gran Acuifero Maya (GAM) project identified the 216 mile (347km) cave after months of exploring a maze of underwater channels.

The project, which is dedicated to the study and preservation of the subterranean waters of the Yucatan peninsula, said the discovery could shine new light on the ancient Mayan civilisation.

Near the beach resort of Tulum, the group found that the cave system known as Sac Actun, once measured at 163 miles (263km), communicated with the 52 mile (83km) Dos Ojos system, the GAM said in a statement. Because of this, Sac Actun has now absorbed Dos Ojos.

Guillermo de Anda, the director of GAM and an underwater archaeologist, said the “amazing” find would help to understand the development of the rich culture of the region, which was dominated by the Mayan civilisation before the Spanish conquest.

“It allows us to appreciate much more clearly how the rituals, the pilgrimage sites and ultimately the great pre-Hispanic settlements that we know emerged,” he told Reuters.

The finding has been described as ‘amazing’ (Reuters) (Herbert Mayrl/Courtesy Gran Acuifero Maya Project (GAM)/Handout via REUTERS)

Mr de Anda and his team previously discovered what they believed was a hidden passageway beneath a 1,000-year-old Mayan temple.

The experts thought the tunnel under the Kulkulcan pyramid, which is part of the Chichen Itza archaeological site in Yucatan, could lead to a natural sinkhole linked to subterranean waters, known as a cenote.

The Yucatan peninsula is studded with monumental relics of the Mayan people, whose cities drew upon an extensive network cenotes.

The experts through the tunnel could lead to a natural sinkhole Reuters

Some cenotes acquired particular religious significance to the Mayans, whose descendents continue to inhabit the region.