Trip reports

See what the Add Helium team has been up to with trip reports, photos and videos of our diving – both local and abroad!

Obesity, Fitness and Diving

It is not a secret that obesity is a growing problem in the United States. Obesity is getting daily exposure on the TV networks, radio stations, newspapers, and magazines. While standing in the supermarket checkout line, one is tempted to read magazine headlines promising wonder-diets and exercise routines to transform the overweight in only a,

Rebreather Myths

In today’s world, navigating available rebreather information can be confusing, frustrating, and misleading. Consumers enquiring about rebreathers are often surprised by how disconnected the industry is. Over the years the Add Helium staff has had the pleasure of speaking with many people that wish to purchase a rebreather. Usually, we are not the first rebreather,

Coming Full Circle: Diving the O2ptima…again.

By October of 2007, I had become an Optima diver. Trading in my doubles for a rebreather was a careful decision; one involving research and asking questions. I certainly did not want to buy a “garage made” rebreather and Dive Rite, a major manufacturer of technical diving equipment, was presenting a “factory made” rebreather. Eventually,,

Because rocket fuel is too expensive

“Because rocket fu​​el is too expensive.” This was one of the reasons that Add Helium Staff Instructor Robert Johnson cited for his interest in rebreathers. He wanted to go where few people had gone and see something amazing. Talking about space, he said, “Look how far you would have to go before you get to,

Intrapulmonary Shunts: Another Cause for a Right-Left Shunt

Many of us are familiar with the concept of PFO’s and how they may be responsible for allowing bubbles to cross from the venous (pulmonary) to the arterial side. When this occurs, we are talking about a Right-Left Shunt, RLS and a potentially increased risk for developing Type II DCS. There are other sources that,

A Letter of Caution from NEDU: Don’t Dive Cold When You Don’t Have to

Many of us may be familiar with the NEDU study:​​​SXLLM​​​ Gerth WA, Ruterbusch VL, Long ET – The Influence of Thermal Exposure on Diver Susceptibility to Decompression Sickness Technical Report. Panama City (FL); Navy Experimental Diving Unit; 2007. Report No: 06-07 http://archive.rubicon-foundation.org/xmlui/bitstream/handle/123456789/5063/NEDU_2007_06.pdf However, some divers have mistaken the data to mean that they should be,

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How Much Is In Your Loop?

Although alluded to in your initial rebreather training, the idea of ‘optimal loop volume’ escapes some divers. Even among advanced rebreather divers, the loop appears to be managing them instead of them managing their loop. They learned to cope, instead of, to control it.

Myth Buster

Myth Buster: Argon, the Superior Dry Suit Inflation Gas?

Staying warm during the dive is not just a matter of comfort. As we have learned from the 2007 NEDU study, it also affects our decompression and, subsequently, our DCS risk. Supplemental insulation provided by dry and wet suits will shift the Lower Critical Temperature (which is the ambient temperature at which heat production responses are initiated) to lower values and thus, delays the onset of core cooling as water tempera

The Pit – Trip Report & Video

The Pit is the name for a particular section of cave that is part of the Sistema Dos Ojos caves located in Tulum, Quintana Roo on the Yucatán Peninsula. For years, many dives had occurred in this section of Dos Ojos, until the mid-1990’s when Paul Heinerth observed there was a deep passage that seemed to keep going. In the subsequent years, Paul and Jill Heitheth, along with others made a few exploration dives into the Pit, reaching as far back as 3000 feet, at an average depth of 320 feet, to a