October 2020

Full Cave Navigation Protocols in Mexico

Guide line in Cenote Chac Mool, Yucatán Peninsula, Mexico. Photo by Larry Cohen.

I started cave diving in Italy in 1990. At that time, the rules were very clear, codified and related to the kind of caves that were encountered in my region. Very often, they were resurgences with current (sometimes strong) or sumps inside caves, with water ranging from crystal clear to the color of coffee and variable visibility, depending on the rains.

Lockdown Local Diving

Photo by Kate Jonker: Speckled klipfish at Pinnacle dive site in Gordon’s Bay, South Africa

As many divers face travel restrictions during the coronavirus pandemic, our contributors highlight the often overlooked or unsung yet intriguing diving that can be found in one's own backyard.

St Helena: Diving in the Remote South Atlantic Oasis

Whale shark, St Helena. Photo by Scott Bennett.

Outside my window, the South Atlantic lay unbroken—an azure expanse of ocean below and sky above. Three hours after passing the Namibian coast, a lone patch of clouds appeared on the horizon. As we approached, I could just discern patches of green peering through. Atop a narrow ridge, a tiny strip of runway appeared, the sheer drops at each end plummeting to the sea.

Defensive Diving, Part 2

“Dive the same way as you drive. Watch the ocean as you watch the road.”

In Part I of this two-part series (see issue 100), I made a correlation between scuba diving and driving a car, particularly in the context of learning how to anticipate and assess dangerous situations, make well-informed sensible decisions and stay safe—things that motorists tend to group together under the catch-all phrase of defensive driving.

My Favorite Wreck Dive: Contributors' Picks

Photo by Scott Bennett: Diver and coral on the MV Shake’M wreck in Grenada. Exposure: ISO 400, f/13, 1/100s. Camera gear: Nikon D810 camera, 10.5mm Nikon lens, Seacam housing, two Ikelite D160 strobes

We asked our contributors what their favorite wreck dive was and they answered with tales and images of remarkable wrecks of all sorts and the artifacts found on them, giving first-hand accounts of their experiences on these underwater time capsules as well as glimpses into the history of each wreck.

Japan's Hachijō-jima

Wrought iron and Japanese butterflyfishes forming a loose shoal, Hachijō-jima, Japan. Photo by Richard Smith.

Japan’s diving scene used to be a well-kept secret, but more and more people have realised that Japan has much more to offer than just sushi and karaoke. The country spans a vast latitudinal range, from the tropical south where coral reefs dominate around Okinawa and the other Ryukyu Islands, into the almost subarctic north. As a result, its biological diversity is great, with many different habitats accommodating a wide array of species.

Sharks at risk from quest to develop vaccine against corona virus

Development of a vaccine against Covid-19 could come at the expense of sharks, researchers warn; A key ingredient used in vaccines to enhance immune response and increase effectiveness, squalene — an oily substance found in plants and even human skin — is particularly concentrated in shark livers.