Blue Hole

• World’s second-deepest blue hole, around 900 ft deep, was discovered in Chetumal Bay, off the coast of Yucatan Peninsula in Mexico.
• It has been named Taam Ja’, which means ‘deep water’ in Mayan.
• The world’s deepest known deep hole was discovered in the South China Sea in 2016, and is known as the Dragon Hole or Longdong.
  • As per the records, it’s 987 ft deep.

About Blue holes

• Blue holes are large, undersea vertical caves or sinkholes found in coastal regions.
• Many contain a high diversity of plant and marine life, including corals, sea turtles and sharks.
• Blue Holes are found on coastal karst platforms around the world.
• They are believed to have been formed in the Ice Age around 11,000 years ago, when the sea level was as low as 100–120 m lower than current levels.
• Blue holes typically contain tidally influenced water of fresh, marine, or mixed chemistry.
• Their water circulation is poor, and they are commonly anoxic(oxygen deficient) below a certain depth.