blue hole

Blue holes

Blue holes are giant and sudden drops in underwater elevation
that get their name from the dark and foreboding blue tone they exhibit when viewed from above in relationship to surrounding waters. They can be hundreds of feet deep and while divers are able to explore some of them they are largely devoid of oxygen that would support sea life due to poor water circulation - leaving them eerily empty. Some blue holes, however, contain ancient fossil remains that have been discovered, preserved in their depths.

2

Blue Hole

Also called “Devil’s Puddle,” the Blue Hole is located southern New Jersey, in the Winslow Wildlife Management Area. Many legends surround this mysterious body of water, and it is alleged that it is the famed Jersey Devil’s portal back to hell. Other legends state that the pool is bottomless, that the water is freezing year-round, and that strange whirlpools will attempt to suck down swimmers into the pool’s depths. Some say the pool has a bottom, but is made of fine “sugar sand” that acts like quicksand. Visits to the pool report crystal clear water and an unsettling stillness to the pond. There are no signs of life in its waters. Decades ago, it was a popular swimming hole for locals, but slowly gained its creepy reputation over the years. With its creepy stillness and oddly clear water, it is easy to see how the Blue Hole could cause uneasiness in its visitors.

The Sawmill Sink is a blue hole located in the Bahamas. It was originally the site of an archaeological dig meaning that it was once dry. As water levels rose, the hole slowly filled with water and preserved the bones that were within the hole. Fossils, including that of a giant tortoise, birds, seeds, flowers, and plants were discovered. The most intriguing thing found was the remains of a giant crocodile, which researchers believe were killed off by locals living in the area at the time. The hole also held the remains of some of the earliest known residents of the Bahamas. They were estimated to be around 1,050 years old.

The Great Blue Hole, Belize

There are many blue holes - underwater sinkholes in the Belize Sea - and the Great Blue Hole is the largest and most famous one off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 90 kilometers from the mainland and Belize City. The hole is circular in shape, more than 300 meters wide, and 122 meters deep. Today it is a perfect site for diving.

Belize's Famous 'Blue Hole' Reveal Clues to the Maya's Demise

SAN FRANCISCO — The ancient Mayan civilization collapsed due to a century-long drought, new research suggests.

Minerals taken from Belize’s famous underwater cave, known as the Blue Hole, as well as lagoons nearby, show that an extreme drought occurred between A.D. 800 and A.D. 900, right when the Mayan civilization disintegrated. After the rains returned, the Mayans moved north — but they disappeared again a few centuries later, and that disappearance occurred at the same time as another dry spell, the sediments reveal.

Although the findings aren’t the first to tie a drought to the Mayan culture’s demise, the new results strengthen the case that dry periods were indeed the culprit. That’s because the data come from several spots in a region central to the Mayan heartland, said study co-author André Droxler, an Earth scientist at Rice University. Read more.