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Tech Dive Articles

Hedging the Bet Against Oxygen Toxicity

by Tim Peever

Some Physiological Factors and Possible Controls of Oxygen Toxicity

Oxygen Toxicity manifests itself in two ways, pulmonary oxygen toxicity and central nervous system (CNS) oxygen toxicity. Of these, CNS oxygen toxicity is the most serious concern to scuba divers.

Pulmonary oxygen toxicity involves attack on the gas transfer membranes in the lungs by oxygen free radicals from long-term exposure to high partial pressures of oxygen. The time involved to manifest symptoms of pulmonary oxygen toxicity is many hours and would not affect a diver except in cases of recompression therapy.

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Technical Diving Articles…Contribute Your Own!

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Articles in this section are geared toward technical diving, but can provide useful information to every diver. Articles about nitrox, mixed gasses, decompression, technical training, deep diving, how to, etc. are just a few of the many topics that can be found in this section.

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What’s so Technical About Technical Diving?

by Ron Carlo

CCR rebreathers and decompression diving fit the definition of technical diving

Good question. Or maybe this should be titled “Just What IS Technical Diving?” That’s what I’m going to discuss. Here’s what I’m going to touch on in hopes you’ll come away with a desire to pursue this exciting side of diving:

1. What technical diving is
2. What technical diving encompasses
3. Some equipment needs
4. Training options

Technical diving is often considered: 1) A discipline that utilizes special techniques, equipment, training, and skills to improve underwater performance and safety; 2); Any diving that involves deeper and longer exposures than traditional recreational standards; 3) Diving in an overhead environment of a wreck or a cave where the diver cannot freely ascend to the surface, 4) Akin to the spirit of rock climbing and wilderness trekking, where the motivation for tech diving is a personal challenge and a thrill of exploration; 5) Having more stuff than you can carry and couldn’t possibly ever pay for when you get the credit-card bill.

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Drift Decompression Diving

by David Miner

Diver deploying a lift bag on a free ascent decompression drift dive

Standard drift diving is a specialized form of boat diving allowing you to drift with the underwater currents during your entire dive. The boat is never anchored or moored and follows the group of divers the entire time. The different types of drift diving are: float drift and live boat drift. Float drift diving involves the use of a float with a down line or drift line that is towed by the dive leader or divemaster and always lets the boat captain know where the group is. The boat captain follows the float on the surface. Live boat drift diving requires no drift line forcing the boat captain and crew to follow the divers’ bubbles as they drift along.

However, there are also sometimes strong currents on deeper wrecks or other dive sites where you don’t want to drift during the dive, but must drift during your decompression stops on the way to the surface. There are several forms of drift decompressing after the dive is complete, anchor line drift decompressing, float/buoy line decompressing, and free ascent decompressing. Whether drifting for the entire dive or diving a wreck and only drifting while decompressing, there are things to consider and special equipment needed to safely complete your decompressions stops and surface with the boat waiting to pick you up.

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  • it is recommended that a dive team diving from an anchored boat begin their dive
  • it is recommended that a dive team diving from an anchored boat begin their dive:
  • decompression line for scuba boats