teksimple:
"The [DCS] symptoms may well have been provoked by carrying out work at excessive depth."
Since the algorithm's on both the VR-3 and HH are both modified Haldanean, I propose that using a dual-phase model such as RGBM (eg more deep stops, less shallow stops) may have helped reduce the chance of DCS at that depth. Any comments on why he did not use Abyss or Vplanner tables? Would David Shaw venture to post his deco schedule or a trace from his HH?
I found out a bit more about the dive..
ALL the predive profiles were done with VPM, The 2 vr3s and nitek He were there strictly as timers..
in the divers words
"I was carrying two VR3s and a Nitek He, but I was only going to be using them as bottom timers. The VR3 algorithm at this depth was not for me. The dive would have been far too long. The Nitek He could not cope with the fact I was diving a rebreather and would be bent in a flash, thus my decision to use VPM-B generated tables."
My guess is that he Had the HH on a very agressive GF to have it come close to VPM..
About the dcs here is a quote from the diver
"While resting I noted a dull ache in my left forearm. My Nitek He computer had been too tight around my wrist but I had not noticed at the time. It obviously had restricted the blood flow and now I was paying the consequences. The pain did not reduce with O2 therapy, or overnight so the next morning I elected to go to the Welkom chamber just in case. DAN decided it was best to undergo treatment in the chamber as a precaution. The pain went within two hours of starting the treatment."
About the performance of his equipment
"One VR3 had failed as I reached the bottom but the other soldiered on faithfully. I had tied off and was exploring, at a depth of 260m and descending. The unit was breathing well. The Hammerhead was keeping an accurate 1.3 PPO2 and I was relaxed and could almost not believe where I was."