Famous examples include the 410-foot Great Blue Hole in Belize, the 663-foot Dean's Blue Hole in the Bahamas and the 328-foot Blue Hole in the Red Sea near Dahab, Egypt.

Dragon Blue Hole in the South China Sea If you are looking for the deepest underwater sinkhole in the world, this is your next travel destination. The Dragon Blue Hole in China is over 300 meters ...

The largest blue hole in the world, called Taam Ja', is located in Chetumal Bay off the coast of Mexico. Blue holes are massive underwater sink holes that can span the length of skyscrapers.

The Taam Ja’ Blue Hole is located in the Chetumal Bay off the Yucatan Peninsula in Mexico and extends at least 1,380 feet below sea level making it 390 feet deeper than the previous record holder. 4 ...

That’s 480 feet deeper than the previous record holder, the Sansha Yongle Blue Hole, aka the Dragon Hole, in the South China Sea, which measures 990 feet to the bottom.

Location of the Taam ja' Blue Hole in Chetumal Bay, Mexico, along with images from scuba explorations of the TJBH at depths of 5, 20 and 30 meters below sea level.

As the crew, including Branson, descended, they marveled at the usual suspects: sea turtles, reef sharks, and giant corals. But as they reached the 90-meter (295-foot) mark, life started to vanish.