Quicksplained: All about the world’s deepest blue hole discovered in Mexico

In quest of the unknown, scientists have discovered a blue hole so deep that they couldn’t even reach its bottom.

A team of researchers ran an expedition to find the depth of Taam Ja’ blue hole in Mexico’s Chetumal Bay but ran out of measuring cable when they reached at least 1,380 feet (420 metres) below the sea level, as per a report they published in journal Frontiers in Marine Science.

According to Live Science, blue holes, scientifically called Karst formations, are unique geological formations found in coastal regions where the bedrock is made of soluble material, such as limestone, marble or gypsum. They form when water on the surface percolates through the rock, dissolving minerals and widening cracks, which eventually causes the rock to collapse, creating a vertical cavern filled with water.

This mysterious natural wonder has not only piqued curiosity about the planet’s history among geologists and biologists across the globe but its breathtaking beauty has also unlocked the interests of marine adventurers. Here’s what we know about the Taam Ja’ blue hole.

1. Taam Ja’ blue hole, is located near the border of Mexico and Belize and is close to several other blue holes in Chetumal Bay. It is named after the Mayan phrase for “deep water”. First discovered in 2021, the team of scientists only reached 900 feet using echo-sounders (which rely on sound waves).

2. Taam Ja’ now reigns as the deepest known blue hole, eclipsing the Dragon Hole in the South China Sea. With a depth of approximately 990 feet, it surpasses Dean’s Blue Hole in the Bahamas, the third-deepest, by over 300 feet. For a better understanding, the Taam Ja’ blue hole is nearly as deep as the Trump Tower in Chicago, according to The New York Times report.

3. With technological advancements, an expedition spearheaded in December 2023 aimed to gain deeper insights. The team employed a state-of-the-art CTD (conductivity, temperature, and depth) profiler. Despite its capabilities, the researchers encountered limitations as the cable ceased to descend at 1,380 feet, potentially hindered by underwater ledges or vigorous currents, the researchers wrote.

4. The study proposes that the Taam Ja blue hole might be linked to the ocean through an unexplored intricate system of tunnels and caves. Using the profiler, researchers identified various water layers within the blue hole, notably one below 1,312 feet (400 m) exhibiting similar temperature and salinity to the Caribbean Sea and nearby coastal reef lagoons. This suggests that this hidden world could harbour undiscovered life forms, thriving in the depths.

5. The discovery of Taam Jaa blue hole holds significance beyond its remarkable depth; it provides a glimpse into Earth’s history by revealing past climatic conditions and geological processes. Such eerie blue holes like Taam Ja’ are hubs of biodiversity, hosting a wide array of plant and marine species such as corals, sea turtles, and sharks. Not only helpful in research, they offer crucial insights into the ocean’s health and the effects of human activities on underwater environments.

With inputs from agencies