equipment failure ... or operator error?
In DAN’s report on sport diving
fatalities in 2002, several deaths
involved buoyancy control problems
that include improper
weighting or other weight belt
problems. According to a study
published in the SPUMS (South Pacific Undersea Medical Society)
Journal, weight belts were implicated
in 7 percent of the equipmentrelated
incidents and accidents (33
incidents out of 457), including
DCS and drowning. Most are easily
avoided.
Consider this experienced but
obese and poorly conditioned 50-
year-old divemaster who made a
wreck dive to 125 fsw. After he signaled
his buddies that he wanted
to ascend, he became separated
on the way up. Ten months later,
his body was found in the wreck by
another group of divers. He had
removed his weight belt, but it was
entangled in his catch bag.
Proper handling of weights is
an essential and basic diving skill,
yet every year divers ignore their
training – sometimes with disastrous
results. A 48-year-old male,
who had received his open-water
training only one month earlier,
was fishing with friends when he
decided to go diving alone and disappeared.
When his body was
found two days later, the rookie
diver had several weights in his
pockets, which of course makes
them difficult to ditch and contributed
to his drowning.
A 50-year-old diver with only
five dives became separated from
his buddy and ran out of air. Sadly,
he had incorrectly attached the
weights on his belt, and couldn’t
release the buckle. Found unconscious,
he couldn’t be resuscitated.
At the end of an extended
dive, two buddies surfaced and
began swimming to shore against
a strong current. The 31-year-old
diver slipped back underwater and
wasn’t recovered for a month. He
had released his weight belt, but it
had gotten caught in his BCD
straps.
In training, divers are warned
to avoid putting other equipment
straps over their weight belts. It
can be just as important to avoid
placing the belt over other equipment. Consider the case of the
65-year-old who made a solo dive
from a boat to retrieve a lost ladder
in 20 feet of water. While suiting
up, he made two serious mistakes.
He didn’t connect the
power inflator to his BCD, and he
put his weight belt over the hose
leading to his second stage. He
hit the water and descended, but
he was caught up in a strong current. His body was recovered the
following day.
And, this reminds us of another
death in Florida. A diver sat on
the gunwale, wearing his weight
belt and no fins or BC. He fell
overboard, plummeted downward,
and died.
Sometimes weight belts can cause problems for others. A 24-
year-old with only 15 lifetime dives
attempted to help her buddy who
was having difficulty with his
weight belt. While coming to her
buddy’s aid, she dropped the regulator
from her mouth. Her buddy
then lost his weight belt and rose
to the surface. On the way up, he
lost a fin and his tank came loose
from his buoyancy compensation device. Yet, he survived, while the
young woman was found on the
bottom dead, with the regulator
out of her mouth.
A poorly prepared or panicky
buddy can be more of a liability
than an asset. Yet, buddies can
help insure that each is properly
configured and ready to dive.
Solo divers have no one else to
double-check their gear, so it’s
especially important that they
thoroughly check their gear configuration
and ensure that it’s all
in working order.
The SPUMS report identified
several problems involving weight
belt technique. If divers remove
weight belts above or below the
surface and grab the buckle end of
the belt, weights may drop them
from the belt. Experienced divers
put a twist in the belt where it passes
through the weight (or use
clips) to prevent weights from slipping.
Too long a belt can get tangled
and prevent release, or can
get snagged and cause an inadvertent
release. With too short a belt,
a diver may have difficulty adjusting
belt tension during the dive or
resecuring a loosened belt. And,
many dead divers just pack too
much weight; a properly weighted
diver will have less difficulty in
maintaining neutral buoyancy
throughout a dive and be more
capable of dealing with a sudden
loss of weight.
Some distressed divers just
don’t drop their weights. A 41-yearold
with fewer than five lifetime
dives experienced buoyancy problems
when he was unable to inflate
his BCD or dry suit properly, and
became separated from his buddy.
His body was found on the bottom,
with his weight belt still on.
SPUMS suggests that one reason
for the reluctance to ditch weight
belts is that it isn’t an easy (or necessarily
safe) drill to practice. So,
when a situation goes out of control,
ditching the belt isn’t a natural
response. However, any wellprepared
diver should be able to
take his belt off and put it on again
underwater. What better way to
while away a safety stop than to
practice this vital skill? Then you’ll
be ready to drop your lead if the
situation turns sour.
Weight management is only
one part of buoyancy control, of
course. As noted above, BCDs and
dry suits must also be set up correctly,
and kept in proper trim
throughout the dive. That lesson
was sadly lost on an experienced
divemaster who passed out while
swimming back to shore in a kelp
bed. Four days later in a local hospital,
she died of complications of
near-drowning. She had failed to
connect her auto-inflator hose to
her BCD.
Buoyancy control problems
can start that chain reaction that
leads to panic, the diver’s worst enemy. For instance, DAN reported
on a 41-year-old diver who had
difficulty with the auto inflator on
his buoyancy compensator. He
signaled he was out of air five
minutes into the dive. He made a
panicked ascent, lost consciousness
at the surface, and died of
pulmonary barotrauma. In another
case, a diver with 100 lifetime
dives descended to 120 fsw. He
was unable to manage the buoyancy
of his dry suit, and made an
uncontrolled ascent from the bottom
and died, due to pulmonary
barotrauma.
It makes sense to begin your
next dive trip by getting your buoyancy
under control. At the surface,
deflate your BCD and hold a normal
inhalation. You should float
naturally at eye level. Underwater,
you should be able to rise a few
inches by taking a deep breath
(keep it to a few inches, to avoid
an embolism), then sink slowly by
exhaling. Your weight placement
should allow you to swim in a
more efficient horizontal position,
not with your feet below your head
and without rolling from side to
side. You should be able to hang
vertically at your desired depth
without finning or dangling off the
anchor line. And, if you dive with
various gear configurations, you’ll
need to adjust your weights accordingly.
Just because you wear 10
pounds with 3 mil of rubber, doesn’t
mean you need 10 pounds in a
skin. Travel light.