Straits of Mackinac diver death

[Claymore]

There is a thread on ScubaBoard in the Accidents and Incidents forum on this incident.
Diving accident on the Cedarville
It appears that there was a series of major mistakes made by both divers that lead to one dead and another going on a chamber ride.

This does appear to be one of those incidents where there are multiple things to be learned from a tragic accident.