CAPTAIN SINBAD
Contributor
I am noticing that some TDI instructors are no longer teaching ANDP and are teaching Helitrox instead. While research into gas density and work of breathing isn't entirely new, it is causing a number of instructors to introduce Helium at depths that were previously suggested by DIR agencies (100')
"Helium appears to be the immediate solution for divers who are concerned about WOB and correlated medical issues (immersion pulmonary edema, CO2 retention, etc.) and for technical divers who are doing even normal dives to moderate depths. Seven times less dense than nitrogen, helium also ameliorates the severity of narcosis but brings with it a host of new obstacles, including extended decompression, cost and high-pressure neurological syndrome (HPNS) concerns."
Alert Diver | Performance Under Pressure
While availability of Helium and price of it (in many parts of the world) remains a factor, are we starting to see a general trend where technical diving courses will/should start with Helium at the entry level? Id also love to hear from technical diving instructors who hold the notion that diving to 150' orr 170' has "lessons for the technical diver" as has always been claimed by John Chatterton.
Thanks.
"Helium appears to be the immediate solution for divers who are concerned about WOB and correlated medical issues (immersion pulmonary edema, CO2 retention, etc.) and for technical divers who are doing even normal dives to moderate depths. Seven times less dense than nitrogen, helium also ameliorates the severity of narcosis but brings with it a host of new obstacles, including extended decompression, cost and high-pressure neurological syndrome (HPNS) concerns."
Alert Diver | Performance Under Pressure
While availability of Helium and price of it (in many parts of the world) remains a factor, are we starting to see a general trend where technical diving courses will/should start with Helium at the entry level? Id also love to hear from technical diving instructors who hold the notion that diving to 150' orr 170' has "lessons for the technical diver" as has always been claimed by John Chatterton.
Thanks.