The Taam Ja’ blue hole, a massive underwater chasm in Chetumal Bay on the eastern coast of Mexico’s Yucatán Peninsula, has just been identified as the deepest blue hole in the world.

Scientists just discovered the deepest sinkhole in the world off the coast of the Paracel Islands, disputed territory in the South China Sea. The Sansha Yongle Blue Hole is almost 1,000 feet deep ...