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June 2019    Download the Entire Issue (PDF) Vol. 34, No. 6   RSS Feed for Undercurrent Issues
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Helium Is Now Harder to Get

from the June, 2019 issue of Undercurrent   Subscribe Now

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If you suffer from nitrogen narcosis, breathing trimix might be the answer. Some training agencies, such as Global Underwater Explorers, suggest that any diver going deeper than 100 feet should be using trimix instead of nitrox or even plain air -- that's because reducing the amount of nitrogen and oxygen in the mix decreases your likelihood of nitrogen narcosis while avoiding oxygen toxicity.

If you read the travel articles about Truk in Undercurrent's last two issues, you'll remember our wreck-diving writer reckoned her recall of what she saw at depth then was better than during a previous visit when she used air, even though most of her wreck divers were not that deep. The amount of helium in the mix is varied according to the depth to which a diver intends to go. Technical divers use a mix that is hypoxic (in the shallows) for the deepest parts of their dives....

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