Hey Jazz,
We could find no reason whatsoever for this guy's DCI hit. This was a Very Very conservative dive, just 11 minutes in duration, at 13m. No rapid ascent, he did a safety stop, nothing out of the ordinary at all. He was a new diver, did his OW and AOW there on the project, but caught on to diving quickly and was very safety oriented. The dive physician in Lumut, who I thought was excellent, recommended that he have a complete physical when he returned home to rule out any underlying problem that might predispose him to DCI. He did return to the project after his sessions in the chamber, but he didn't dive again. The dive physician in Lumut recommended a month off diving at the least.
He was using a dive computer, though I don't remember the brand, but with his incredibly conservative profile it didn't matter anyway.
Sometimes the odds are against you.
Be safe out there.
Beck
PS. I had to deal with the Australian folks at DAN and found them to be very helpful. Keep at it!