Are 6351-T6 Alloy Scuba Cylinders Safe to Use?

After the rupturing of two alloy scuba cylinders, many wonder if they are safe to use? While cracking was documented in these cylinders, a major issue with their use is lack of consistent training and regulation in the testers, inspectors and fill-station operators.

A Black man inspects a cylinder with a tiny rope light

Scuba Cylinder Rundown

The 11-liter aluminum 80, aptly named for its 11-liter internal volume and 80-cubic-foot (2.3 cubic meter) capacity when filled to its 200 bar/3,000 PSI rated pressure, is by far the […]

Heated Garments

GETTING COLD ON A DIVE IS UNPLEASANT, but if it progresses to hypothermia, it becomes potentially fatal. Even more than discomfort, considering the physiological and psychological stress it can cause, being cold is potentially risky.

Decompression, Stage, and Bailout Cylinders

DIFFERENT TERMS CAN SOMETIMES DESCRIBE the same piece of equipment in the dive industry. What some divers call a dive light, for example, others call a dive torch. They are physically identical, so the names are interchangeable …

dive industry equipment terminology confusion; dive industry equipment terminology confusion

The Dive Light: A Tool for All Divers

The dive light is essential equipment that can benefit all divers on most dives. There are several types of lights with various uses and a few key considerations you should make before purchasing. There is no one-size-fits-all approach to dive lights, so each diver must carefully consider their own goals and needs before deciding which model is most useful.

Lights are tools for all divers

Dive in the Fast Lane with DPVs

NEW AND IMPROVED TECHNOLOGY enters the dive industry every year. Divers of all experience levels can now utilize smaller, lighter, faster, quieter, and more reliable DPVs to make their diving safer and more enjoyable. 


Dive Knives and Cutting Devices

THE DIVE KNIFE IS AN ICONIC PART OF A SCUBA DIVER’S GEAR. Since the inception of diving as a recreational activity, the dive knife’s presence in a diver’s equipment has […]


It’s All About the Toys

Technological advances have greatly changed and improved the dive experience. Learn more about these advances.

Diver floats through a shipwreck. The diver is wearing a blue wetsuit.

Freediving Fins Reinvented

IN THE 1900s UMBERTO PELIZZARI was a young diver from Busto Arsizio, Italy, who was making headlines by breaking world records in constant weight and variable weight freediving. Needing an […]

Carbon fiber fins, safer freediving, Alert Diver magazine Q4 2023

Go Where No One Has Gone Before

To pee or not to pee? That is not the question for technical divers, instructors, or others who spend long hours in the water. Proper hydration and comfort ensure that urine will flow. The question is, What’s the best way to handle it? 

Andy Pitkin uses a bailout rebreather and dual scooters