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38 minutes on a 51 ft dive with a tank at 2800 PSI is not bad, especially for beginning divers! Something's strange here.
Really............bet half or more here might have failed too......either get another instructor(2nd time around will be a breeze) or sue the instructor for being too hard...lol.....GEAUX TIGERS.........
I failed my O/W dives for breathing too much. When I would lay down at 25 f for 5 min I consumed 100. However when I would swim around my air consumption increased drastically so my dives could only last 35 min, my longest being 38 on a tank filled to 2800. I was able to get down to 51 ft and do all the basic skills.
The second issue (minor) was when I would swim using my leg/fins after a few mins my ankle would feel tired.
Any advice is appreciate. I have my next round of dives in two weeks. I have been working out at the gym to increase my leg strength, cardiovasicular system hoping that does something...
My instructor basically said he was worried that if I did a much deeper dive, I just wouldn't last and need to get this issue worked on.
Oh yeah, the laying down for 5 minutes skill. I remember now.