Tough Divers. Larry “Harris” Taylor
didn’t agree with the conclusions of
the author of our piece on how scuba
divers seem to have a higher pain
threshold. While the author believed
that nitrogen solubility, cold, and
concentration were possible explanations
for reduced pain, Dr. Taylor says
“I submit that the presence of
‘exercise-induced’ beta endorphin is
a more likely explanation, since it has
been repeatedly demonstrated that
divers show increased levels of beta
endorphin, the body’s endogenous
opioid peptide.”
Loud Shrimp. As divers, we know
that the Silent World isn’t very silent;
fish and critter sounds are ubiquitous.
But just how noisy is it? Researchers
from the New England
Aquarium, MIT, and Cornell University
found that whaling areas in the
North Atlantic have about the same
noise level as a busy New York
intersection, or more than 100
decibels. Clicking noises of shrimp
registered more than 80 decibels.
Missed the Point. Just like the
Beardstown Ladies, Ben didn’t get his
math right in the piece on the rate of
bends among Navy divers: he moved
a decimal point. Out of 10,000 dives,
there was an accident rate of .039
percent and a DCS rate of .026
percent, or 200 times less than
conventional wisdom holds. Thanks
to readers Ken Kurtis and Joe Myers for getting the numbers right.
Blowing Your Hose. New diver Mike
Dice was diving off the Kona Coast
with a newly-purchased TUSA
regulator. He was at a depth of 50
feet when the low pressure hose
hooked up to the second stage he
was breathing from popped out of
the fitting connecting it to the first
stage. After surfacing via buddy
breathing, he checked out the
assembly that blew off. “The hose
on the defective second stage didn’t
appear to have any marks in it that
you would expect to see from a
rubber hose that had a crimp tightly
installed. All the hoses came with a
thin rubber sleeve over the fitting in
question, so I never pulled it back
to see if the crimp was there.” While
his dive store replaced the hose, we
write this both as a cautionary note
to check your hoses and as an
inquiry. If this has happened to you,
let us know.
Blown Tank. On February 1, a
Walter Kidde aluminum cylinder
ruptured at Force E dive shop in
River Beach, Florida. The 17-yearold
technician lost two fingers and
received facial injuries as well. As
happens over the net these days, all
sorts of misinformation circulated
about the explosion, prompting the
man most expert in tanks, Bill
High, president of PSI Inc., to set
the record straight. He reported
that the tank was “manufactured
before July, 1982, and was not part
of any special group of scuba
cylinders subject to recall.” In fact,
he said, “no such list or group
exists.” High says that cylinder
explosions usually can be traced to
damage or abuse in service and that
the six cylinder explosions that
occurred in 1996 were all traceable
to tank problems that would have
been detected well in advance of
the failure if the tank had been
inspected by a properly-trained
technician. High’s PSI, Inc., is
working toward that end: the
company conducts more that 200
workshops each year offering
training in visual inspection of
cylinders. It also offers correspondence
courses. For further information,
contact Professional Scuba
Inspectors, 6531 Northeast 198th
Street, Seattle, WA 98155, 206-442-
8265