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Exley on Mix

I first spoke with Sheck Exley in the summer of 1991. I had begun publishing aquaCORPS: The Journal for Technical Diving, a year earlier and I was working out of the office at Capt. Billy Dean’s dive shop in Key West, Florida, the first technical diving training center in the United States. “Technical diving”, a term we had just coined to describe this new style of diving, was just in its infancy.

Unlocking the secrets of the Greenland Shark

One of the dreams of any naturalist is to be the first to find and detail the life of a hidden or unknown animal first hand. Since 2003, scientific divers with the Greenland Shark and Elasmobranch Education and Research Group (GEERG) have begun to unravel the mysterious life of the Greenland shark, which at over seven meters in maximum body length and exceeding a ton in weight, is the second largest carnivorous shark after the great white.

Seth Casteel Portfolio

Buster the Cavalier King Charles Spaniel, by Seth Casteel

Move over human divers, you’re not the only ones who love to dive. Apparently, divers these days are not just of the hominid kind—American photographer, Seth Casteel, has captured the astounding and often humorous side of our canine companions who love to dive underwater.

Malpelo Island

Three of world’s best shark spots are located far off the coast of Central and South American, in the eastern Pacific Ocean. The least known of them, the tiny Colombian island of Malpelo, together with Galapagos and Cocos, create a “golden triangle” for big fish fans.

What are the risks, really?

Experience of life suggests that anything which is fun tends to be either illegal, immoral, fattening or dangerous. Recreational diving partly conforms to this universal law, ranking below hang gliding and parachuting but above most sports in regards to the risk of a fatal accident.

One might suppose that shark teeth are harder than human teeth but they are not.
One might suppose that shark teeth are harder than human teeth but they are not.

Why sharks don't get cavities

To gain a better understanding of how sharks manage to keep their teeth in such pristine condition, a team of German researchers looked at two species that eat in very different ways

The researchers looked at Isurus oxyrinchus and Galeocerdo cuvier (mako and tiger sharks) and found, as they explain in their paper published in the Journal of Structural Biology, after very close examination, that the outer coating of the shark teeth contained one hundred percent fluoride.