What is in the bottom of the mysterious great blue hole?
Although it has existed since ancient times, the great blue hole in Belize, Central America, still retains its secrets and ambiguity. From time to time, scientific and non-scientific bodies announce an attempt to uncover the mystery of the crater, which was laid on the map in 1971 when French cosmologist Jacques Cousteau explored its depths. Nearly half a century after that attempt, and despite the great development of diving operations, most of the features and terrain of this giant blue hole remain obscure. Jacques Cousteau's grandson, Fabian Costo, recently announced that he was carrying out new research on the crater, as part of an initiative involving scientists, explorers and cinematographers to protect the oceans. A small, manned submarine is expected to reach the depths of the crater, estimated to be about 400 feet deep, and a full survey of the bottom of the crater, about 64 kilometers off the coast of Belize. The crater was thought to have formed part of a gi...