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Here is a thread received on the Australian Tech diving list. Seems like a
record of some sort. There are several posts that I have pieced together.
Hope it is of some interest.


The 300-meter series
Long regarded as the four-minute mile of open circuit scuba diving the
depth of 300m (or 1,000feet) marks the goal of those in the deep diving
community striving to go deeper than anyone before. These divers fall into
their own category for although many divers have been deeper before (in
fact those that use submersible bells, surface supplied gas and other
commercial rigs regularly dive and work at deeper depths) those on open
circuit face infinitely greater risks; it's no exaggeration to say that
they are working at the very limits of physiological knowledge.

In the world of open circuit many world record depth attempts are made in
fresh water sinks. The relatively "ideal" conditions of these environments
make the staging of tanks and logistics that much easier than those who
face the more uncertain conditions of open waters. Unpredictable currents,
surface conditions and a massive difference in surface and bottom
temperatures are just some of the environmental factors taken into

John Bennett is the director of technical diving at Atlantis Tech in the
Philippines. He is no stranger to the logistics, stress and hazards
involved in pushing depth limits; on June 4, 2000 John made a solo dive to
254m, the current world record, in the beautiful waters off Puerto Galera
on the island of Mindoro in the Philippines.

In November 2001 John intends to go deeper than anyone else has ever done
on open circuit scuba in open ocean and Puerto Galera will again set the
stage. John intends to incorporate many of the techniques employed on his
last world record attempt, one of which is the use of a specially built
free floating decompression platform that allows a vertical decent line to
be employed with a four bar trapezium assembled in shallow water for the
longest decompression stops. The unique design allows the platform to be
cut free if necessary and drift with the current while keeping essential
support mechanisms in place.

The team of divers that support John are another key part of any successful
dive and the November team remains almost unchanged from the June 2000
dive: Mark Cox, Targa Man, Ron Loos, Axel Lechwald, Kfir Zorev and
Portuguese depth record holder Jorge Marques are all experienced deep
divers many of whom John trained personally; all train relentlessly and
make regular dives with John. Long briefings and discussion sessions
ensures each knows their role. Equally essential is Joe McLary, a veteran
paramedic who flies in from Hawaii for each deep dive series and takes care
of contingency medical procedures.

John rarely targets a record depth on one dive; in the November 2001
attempt he is allowing a week of dives spaced to allow ample rest and
decompression. Although the first dives are planned as warm ups all dives
are made in such a way for John to be able to attempt the record should
things "feel right".

Months of planning and training have lead to the November 300m series. The
equipment configuration alone caused a delay of two months; the original
quad pack on his back was awkward and restricted movement, the new more
flexible set up consists of a triple pack of OMS low-pressure 20liter tanks
required to carry the huge amounts of bottom gas John will consume (over
620 liters per minute on the bottom; that's a regular scuba tank every four
minutes). John also straps a forth 5.5 liter tank behind the triple set for
dry-suit inflation. OMS also provide a specially constructed canister
light that will be placed between the left hand tanks. Two side slung
11.1-liter tanks make up the last part of the tank rig - these are used for
the first two gas switches in 150m and 90m of water; from there on up John
relies on the support divers to supply decompression gas. Other essential
pieces of equipment that John tests to the limits include Apeks regulators,
Otto Dry-suits and backup lights supplied by Princeton Tec.

In addition to testing the equipment John has also set a tough physical
regime over recent months. His fitness schedule is aimed at maintaining a
very high level of aerobic, cardio-vascular and muscular fitness and
consists of ten workouts each week, five aerobic and five muscular. Diet
is also important and John supports his training regime by eating four
times each day, keeping the carbohydrates high, proteins moderate and fats
low. He adds high quality supplements

Tables have been 'cut' for this special dive using Abyss software and
despite a bottom time of just a few minutes (he plans to descend at 20-30m
per minute) the slow ascent (no faster than 10m per minute from 150m and
up) will bring his total dive time to over eight hours. The dive
incorporates six different trimix blends and although his use of large
amounts of helium at all stages of the dive is somewhat experimental in
dives so far he has made the decompression 'cleaner', cut back on CO2
problems and increased the ease of breathing. Even normal air breaks have
been replaced with switches back to trimix aimed at buffering the oxygen
clock (protecting against oxygen toxicity), reversing vassal constriction
(caused by breathing high PO2's), reversing pulmonary edema (caused by
breathing high PO2's) and cutting back on the amounts of CO2 retained.

In June 2000 John said "I think that's deep enough" but his desire to
explore the underwater world, further man's knowledge of diving physiology
and test himself drive him forward. In his latest venture, a company
called John Bennett Deep Ocean Research International (JBDORI) he and his
partners aim "To go beyond diver training and actively support individuals
and groups that explore the underwater world and extend the boundaries of
diving knowledge".

Australian Tech diving list


>On Tuesday November 6, 2001 John Bennett descended to 305m on open circuit
>scuba, his total dive time was over nine and half hours and despite some
>complications on his ascent John surfaced in good shape and is now
>recovering and resting at Atlantis.
>Our sincere thanks to everyone involved - especially all those is the
>support team, Chuck, Dieter and crew, Frank Doyle and team, Dave Ross and
>Pedro Magsino who helped out at the last minute to make the dive a
>A full official report on the dive will be released in about two weeks.
>The Atlantis Tech Team

Australian Tech diving list


Re the depth, please see the following received yesterday:

"The dive depth was measured by vertical line, the line was weighted with
approximately 70kg (latter measured at 308m/1010 ft on dry land, no stretch
factor was taken into account). The line was not touching the bottom but
hanging freely. A camera was fitted at the bottom of the line by the team
(this was requested by National geographic who filmed the dive). The camera
filmed me clipping off a slate signed by two seperate people."

Foto saknas
Magness Lindström 2001-11-10 18:55:00
56 postningar


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Huvudinlägg Djupaste dyket....eller? Magness Lindström 2001-11-10 18:55
svara SVAR: Djupaste dyket....eller?Stefan Mattsson2001-11-11 13:47
svara SVAR: SVAR: Djupaste dyket....eller?Torbjörn Karlsson2001-11-11 23:57


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