Quote:
Originally Posted by Skinsfan1311
Last week we were diving in Grand Cayman.
The first dive of the day was a max depth of around 100'.
We headed over to the second dive site, which was a very short boat ride. Some of us were jumped off the boat, to cool off, float around, snorkel, (pee!  ), whatever, during our surface intervals.
Upon hearing that the top of the coral-head below was only about 40', this one guy tells his wife that he's going to dive in and see if he could touch it. He then proceeded to try to do so.
Bear in mind, that we were only about 15 minutes into our SI's!.
The DM was quite irate and told the guy that "I've seen people get bent pulling stunts like that! Do not ever do that again!"
Fortunately, the guy did not seem to suffer any injuries, but that sure was an eye-opener and a pretty valuable lesson.
I'm also kinda embarrassed to say that as I watched the guy pull that stunt the thought that it could be dangerous never even crossed my mind!
I've definitely filed that in my "lessons learned" category. |
I've got to plead ignorant on this one.
Why would you expect this diver to get bent free-diving to a 40' depth?
It seems to me that:
1. He wold still have residual N2 in tissues after the first (100') dive.
2. He would introduce additional N2 into his tissues during the free-dive and 3. Increase his surface interval by some small amount.
But, it seems to me that bouncing down to 40' would not present a large risk of getting bent given the "bottom" time of probably less than a minute.
Surface intervals are not "fixed" anyway. If the guy chose to do the first dive at 100', take a 15' surface interval (while the boat moved) and do a subsequent 40' dive - he would simply have a shorter 40' dive - yes?
The problem must be in the introduction of the "bounce" back to the surface during the free dive?