A view of a Gucci's advertisement campaign selected for an exhibition to celebrate creative vision of a creative director Alessandro Michele at Gucci Garden Archetypes, in Florence, Italy, Thursday, May 13, 2021. (Photo by Antonio Calanni/AP Photo)

A gypsy man doing their traditional performance with a Cobra snack during the outbreak of coronavirus disease (COVID-19) at Savar the outskirts of Capital Dhaka, Bangladesh on April 24, 2021. The river gypsies in Bangladesh locally known as “Bede” community. (Photo by Fatima-Tuj Johora/ZUMA Wire/Rex Features/Shutterstock)

In this handout image provided by Red Bull, Maria Paula Quintero of Colombia dives from the 20 metre balcony during the first competition day of the third stop of the Red Bull Cliff Diving World Series on July 01, 2023 at Polignano a Mare, Italy. (Photo by Romina Amato/Red Bull via Getty Images)

A delegate from the indigenous Maasai community blows a horn and wears an ostrich feathers headgear as he arrives for the Africa Climate Summit (ACS) 2023 at the Kenyatta International Convention Centre (KICC) in Nairobi, Kenya on September 6, 2023. (Photo by Monicah Mwangi/Reuters)

Tom Nevins guts a feral pig sow during hunting on Silver Plains Station on October 8, 2011 outside of Coen, Australia. Feral pigs are recognised as environmental and agricultural pests reported to have a population of up to 23.5 million over around half of Australia. The Cooktown Hog Hunt is held annually with this year's hunting window open from registration at 2pm on Friday to the end of weigh in at 2pm on Sunday afternoon. (Photo by Mark Kolbe/Getty Images)

Emperor penguins gathered together to keep their chicks warm in these pictures. Marine scientist Frederique Oliver snapped the protective parents in Antarctica as they huddled against the huge winds.The adorable birds have to battle temperatures on -20 degrees Celsius as well as winds of up to 40 knots on the ice. (Photo by Frederique Oliver/Caters News)

A cenote is a natural phenomenon, a sinkhole in the Earth’s surface. The Yucatan Peninsula in Mexico has an estimated 7,000 cenotes because it is primarily made up of porous limestone. For millions of years, rainfall slowly ate away at the limestone and a huge system of underground caves and caverns was formed. Many filled with water from rain or from the underground water table. When the roof of a water filled cave collapses, a cenote is born. The water found in a cenote may be fresh water, salt water, or both. Structurally it may be completely open, like a lake, almost completely closed with just a small opening at the top, or somewhere in between.