From Quest list - by JJ:

It is with mixed emotion that I write to report a diving accident
experienced by our friend and fellow GUE instructor. My emotions are
mixed
because his accident was serious but his prognosis is hopeful. Over
the last
few days our focus has been to support his family. Yet, I want to take
a
moment to communicate information about this unfortunate accident.

It remains difficult to establish the precise cause; however, as more
information becomes available I will pass along what we discover. I
have
been asked by the family not to reveal a name or personal details
regarding
his medical condition which is serious, involving the central nervous
system. Until they decide otherwise I will honor this request. Yet, I
am
willing to discuss any other details that are known to me.

The diver collapsed after surfacing from a dive in 2 degrees C water
temperature. The dive lasted for 105 minutes at an average depth of
27m (max
of 34) while breathing 30/25; the diver completed 22 minutes of
decompression on oxygen at 6m. There were no problems on the dive and
the
ascent to 6m was slow. The diver appeared okay when first surfacing;
shortly
thereafter he reported feeling "warm", after which he collapsed and
became
unconscious. He was transported to the hospital where he began a
series of
hyperbaric treatments. He is conscious but the full extent of his
injuries
are unclear; over the next couple weeks we are likely to learn more
details.

The lack of problems on the dive, together with the slow, controlled
ascent
make this accident somewhat mysterious. The diver has conducted
hundreds of
similar profiles with many, more aggressive dives. Of course, it is
possible
that a shunt (PFO or pulmonary) allowed gas to pass to the arterial
side.
Given the nature of the dive this seems most likely. However,
preliminary
evaluations have not established the presence of a PFO and a proper
test is
not practical at this point. It is unclear whether the diver had been
previously tested for a PFO. We will have to wait to get clarity on
this
issue. Our thoughts are with our friend and his family.