Chinese researchers discovered what they say is the deepest blue hole in the world, off the disputed Paracel Islands in the South China Sea. The sinkhole was measured at 1,000 feet, deeper than ...

A deep blue hole ... The Taam Ja' Blue Hole (TJBH) in Chetumal Bay, which is off the southeast coast of the Yucatan Peninsula ...

If reports are to go by, the deep drilling race commenced in 1958 with ... Russia, near the Barents Sea. This endeavour, known as the Kola Superdeep Borehole, proved more successful, penetrating ...