14-10 Change A
U.S. Navy Diving ManualVolume 3
Loss of 50 Percent Oxygen Supply During In-Water Decompression. If the
diver cannot be shifted to 50% helium 50% oxygen at 90 fsw or the
50% helium 50% oxygen supply is lost during decompression:
Shift the diver to air and continue the decompression as planned while trying
to correct the problem.
Shift the diver to 50% helium 50% oxygen once the problem is corrected.
Time spent on air counts toward decompression.
If the problem cannot be corrected:
Continue the planned decompression on air.
Shift the diver from air to oxygen upon arrival at the 50 fsw stop.
Breathe oxygen at 50 and 40 fsw for the decompression times indicated
in (Table 14-3), but not to exceed 16 minutes at 50 fsw. Oxygen time at
50 fsw starts when divers are confirmed on oxygen. If the 50 fsw stop
exceeds 16 minutes, travel divers to 40 fsw and add remaining 50 fsw
stop time to your 40 fsw stop time on oxygen.
Surface decompress per paragraph 14-3.11 following completion of the
40 fsw stop.
Loss of Oxygen Supply During In-Water Decompression. If the diver cannot be
shifted to oxygen at 30 fsw or the oxygen supply is lost during the 30 or 20 fsw
Switch back to 50% helium 50% oxygen. If a switch to 50% helium 50% oxy-
gen is not possible, switch the diver to air.
If the problem can be quickly remedied, reventilate the diver with oxygen and
resume the schedule at the point of interruption. Consider any time on helium
oxygen or air as dead time.
If the problem cannot be remedied, initiate surface decompression. Ignore any
time already spent on oxygen at 30 or 20 fsw. The five minute surface interval
requirement for surface decompression begins upon leaving the 30 or 20 fsw
If the problem cannot be remedied and surface decompression is not feasible,
complete the decompression on 50% helium 50% oxygen or air. For 50%
helium 50% oxygen, double the remaining oxygen time at each water stop. For
air, triple the remaining oxygen time.
A diver loses oxygen 15 minutes into the 30 fsw water stop and is switched back
to the 50% helium 50% oxygen decompression mixture. The problem cannot be