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Dr. Ali Lawrie asks for field experience of manifolds vs two independent
cylinders.

I dive in Lake Superior; water temps are just above freezing to about 50 F.
 I, like Dr. Lawrie, could never reach a manifold isolator valve because of a
drysuit and thick underwear.  A valve block in front of the diver would help,
if one exists.

Problem with 2 independent cylinders:  A friend of mine nearly died of the
bends in Lake Superior some years back as a result of not opening the valve
on his second cylinder.  A small but critical error!  He ran out of air at
140 during an ascent from a 190 for 20 exposure.  Lots of permenant damage
resulted.  Buddy was below by 20 feet or so and didn't realize the problem in
time to reach him.

Every equipment configuration has its problems, I guess.

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