A few years ago I was on a dive boat sitting next to a guy with an utter abomination of a dive kit configuration. Kind of a twinset/doubles but with a hard 7 litre (55cf??) stage bolted to the side of the twinset -- looked like one of those Cousteau-style triple cylinder backmount rigs from the 50s/60s. To this he had a "slob-knob" remote manifold lead, and three recreational style regulator sets with console gauges. Regs, guages, crap everywhere.
It was utterly hideous. Seriously, WTF!
I said nothing, but jumped in before him and had a wonderful 2 hour solo deco dive to 41m/135ft as I had a twinset with 21/23 backgas plus two stages with 50% and 80%. Heard boats topside.
When I surfaced there were two lifeboats and a helicopter -- for a moment I thought my boat had sunk! Back on the boat I soon learned that he'd died.
So, for the people who've posted above, what should I have done?
1) Screamed and shouted at him for such a piss-poor ridiculous abomination of that rig?
2) Kept my council and done nothing?
This has somewhat haunted me ever since. It was absolutely and utterly his responsibility to bring the right kit, the right experience and the right training with him. If he needed a buddy, he should have brought one.
Was it my responsibility, along with the other 10 experienced independent divers on that boat to harangue that diver?