Its called the Dragon Hole, and Chinese scientists believe it may be the deepest blue hole on the planet.

Chinas state-run Xinhua news agency says the Dragon Hole is 987 feet deep or more than 300 feet deeper than Deans Blue Hole in the Bahamas.

Blue holes are essentially giant pits in the sea that can plunge hundreds of feet, and are known for the distinctive blue colors visible from above that give them the name.

Dragon Hole is located in the Paracel Islands, also known as Xisha in Chinese, a disputed island group in the South China Sea claimed by China, Taiwan and Vietnam.