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Skill
Number
4
Skill
Carry and use of
additional bailout
gas
Purpose
Details
Carry external
bailout gas cylinder
on dives deeper
than 18 m/60 ft.
Practice use of the
BOV and external
bailout. Perform
static and dynamic
open circuit bailout
drill. Include at least
2 OC ascents from
bottom the bottom
to approximately 6
m/20 ft
To verify bailout
systems function. To
ensure the diver is
correctly weighted
to maintain depth
control under all
urgent/emergency conditions. To
reinforce how to
deal with a hypercapnia situation and
reinforce involved
muscle memory.
The unit should be
weighted to offset
the buoyant volume
of the EXPLORE.
Additional weight is
needed to compensate for their
exposure suits and
additional bailout
cylinder.
6.2
Learning
Requirement
Switch to off-board
open circuit via
the BOV. Ascend
slowly. The biggest
buoyancy change
is in the last 10
m/33 ft, and ideally
the student should
remain horizontal
within this depth
range. Weighting
should be such that
automatic venting
should control the
ascent.
(This skill should
be conducted
twice, 1st along a
contoured bottom
or shot line; the
2nd time with an
SMB.)
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