Sinkholes at sea

 

Lying off the coast of belize, the great blue hole is the widest ocean sinkholes on the planet. A UNESCO World Heritage site, it is nestled deep within the Lighthouse Reef Atoll and is staggering 300 metres (948 feet) in diameter and 125 metres (410 feet) deep. Formed by the falling through of an ancient cave, it used to be on land but rising sea levels thousands of years ago plunged it into the water. Its dry origins are evident in the presence of stalacties, which can only for scuba divers who flocks to it from all over the globe.