Mixed Gas Diving

Front 1

Bottom Time in Excess of the Table:

Back 1

-Foreseen that BT will exceed 120 min, immediately contact NEDU.

-Decompress using the :120 schedule for the deepest depth attained.

-:30 min O2 stop at 40 FSW (O2 time starts when divers ar confirmed on O2).

-Sur D, compress to 60 FSW in the chamber as FAST AS POSSIBLE (100 FPM MAX).

-Treat TT6 with max extensions (2 at 60 FSW, 2 at 30 fsw)

Front 2

Loss of Bottom Mix While on the Bottom:

Back 2

- Go on EGS.

- Abort the Dive.

- If EGS is depleted before reaching 90 FSW, Shift to air.

-Shift to 50/50 at 90 FSW, continue planned decompression

Front 3

Loss of 50/50 During In-Water Decompression

Back 3

- shift to air, continue decompression while making fix.

- Shift back to 50/50 once fixed, time on air counts towards decompression.

*If problem can't be Fixed:
-Continue decompression on air.

-Shift to O2 upon arrival at 50 FSW.

-Breathe O2 at 50 and 40 FSW according to Schedule.

-If the 50 FSW stop exceeds :16 min, travel to 40 FSW, add remaining 50 FSW Stop time to the 40 FSW Stop time (:30 on O2, :05 Air Breaks).

Front 4

Loss of O2 during In-Water Decompression:

Back 4

If divers cannot be shifted to O2 at 30 FSW, or O2 supply is Lost during the 30 or 20 FSW Stops:

- Shift to 50/50 (or air if 50/50 is not available)
- If problem can be fixed rapidly, resume at POI time on 50/50 or air is dead time.
- If problem cannot be fixed SUR D
- If problem cannot be fixed and SUR D is not an option, complete decompression on 50/50 or air.
For 50/50 double & air triple remaining stop time.

Front 5

Loss of O2 Supply during SUR D:

Back 5

- Temporary loss return to O2, time on air is dead time.
- Permanent loss: 50/50 double remaining time & air triple remaining time.
If at 50fsw travel to 40 FSW and allocate 10% at 40 FSW, 20% at 30 FSW, and 70% at 20 FSW.
If loss occurred at 30 FSW, allocate 30% at 30 FSW and &0% at 20 FSW.

Front 6

Ga Supply Contamination

Back 6

- Find source and fix it.
- Could be the EGS valve open on the hat (audible voice change)
- Once corrected, vent each diver for ::20 and confirm the divers are on the correct gas.
- Continue Decompression as planned.

Front 7

CNS O2 Toxicity Sx 90 FSW - 60 FSW:

Back 7

- Up 10 FSW and shift to air.
- Ventilate STRICKEN Diver FIRST, then unaffected diver.
- Stay at shallower stop on air until missed time from previous stop is complete.
- Resume planned decompression (current stop time) on air.
- Upon arrival at the next stop, shift back to 50/50. Ignore any missed time on air. Air good.

Front 8

Convulsion at 90 FSW - 60 FSW Water Stops:

Back 8

- Shift divers to air.
- Vent UNAFFECTED Diver FIRST, Then vent STRICKEN Diver.
- If only one diver in the water, IMMEDIATELY Launch Standby and vent stricken diver.
- After tonic-colonic phase, ascertain if diver is breathing.
- If affected diver is breathing, decompress both divers on Air following original T/S. Shift to 50/50 at 50 FSW. SUR D upon completion of 40 FSW stop.

- If affected diver is not breathing: Split the side. Reposition Head, open airway. Leave unaffected Diver in water (Diving Officer)
Immediately surface Standby and Unconscious Diver at 30 FPM, Treat for AGE IAW 20-1.