#20439
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From mac1954: Why would you need a redundant air supply? Why would you use all of your air supply? Why would you get to a point when you need rescuing?
Ever had or seen an O-ring blow? You won’t make it to the surface before the tank reaches empty. a second air source will let you take your time and do your safety stops.
On a Florida wreck trek a diver with thousands of dives made a rookie mistake and her tank fell landing on the 1st stage, it looked okay but on a later dive the reg hose fitting parted inside the wreck and all of her air was gone in seconds. She wasn’t carrying a pony but another diver who we kidded about being overdressed passed her his long hose on a sling bottle and she finished the dive.
As for being narced, on my first trip to the tropics in 1971, we were diving a wall in Bonaire, this was before depth gauges and I think I was still using a J-valve and no SPG, I could still see the surface so I couldn’t be that deep, right? My Ikelite camera housing was being a PIA, the controls wouldn’t move, the shutter was stuck in and I was too narced to realize I had slipped down the wall past the housings 130’ limit to 170’. A DM pounding on his tank and pointing up saved the day. BTW, the DM was Ebo, Bonaire’s 1st local DM, there are a few reefs there named after or by him.
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