AIR DIVING SUPERVISOR UPDATED EXAM
QUESTIONS AND CORRECT ANSWERS
Safeway Out - CORRECT ANSWERS If only 20' stop in water get to 20'
If 30' stop in the water try to get to 30'
Double the required 02 periods at deepest depth attained.
:60 0n O2 : 15 air break
No repet after safeway out procedure
O2 Toxicity in the chamber on Sur 'D' - CORRECT ANSWERS 1st: 1. off O2
2. Wait til sx subside
3. Wait additional :15
4. Back on O2
2nd: 1. Off O2
2. Wait til sx subside or beathing comfortably
3. Ascend 10' at 1 fpm
4. Resume at point of interruption
3rd: 1. Off o2
2. Complete on air
3. Do air O2 conversion
IN-WATER DCS - CORRECT ANSWERS 1. Launch standby to assist
2. Continue to decompress the other divers according to the original schedule
3. Shift 100% O2 but not if deeper then 40"
4. Descend 10" If significant relief of sx is not obtained, descend additional 10" , but not >40' if
on O2
,5. Remain at tx depth for at least : 30
6. Decompress by multiplying air or O2 stops by 1.5
a.If deeper than 1st stop, insert a stop equal to the 1st stop time
7. If sx free upon surfacing : 100% O2 , TT-5
8. If not sx free upon surfacing : 100% O2, TT-6
Optionally:
1. If less than :05 surface interval, do :30 tx in water then surface and treat as type II in chamber
or
2. Forgo tx in water and surface and treat as Type II in chamber
For all options, observe the diver post tx for at least 6 hours, treat recurrence as Type II
Bottom time in excess of table - CORRECT ANSWERS Immediately contact the NEDU for
advice on how to decompress. If the NEDU cannot be contacted in time, take the following
action:
1. If available , use the U.S.Navy Thaimann Algorithm Dive Planner to compute the
decompression requirement
2. Read down to deeper depths in the Air Decompression Table until a depth is found that has a
schedule that is equal to or longer than the BT and decompress using that T/S.
Air breaks during 30" and 20' O2 stops - CORRECT ANSWERS 1. :30 O2 / :05 air break
2. Air breaks do not count towards required decompression time
3. When an air break is required, shift the console to air for :05 then back to 100% O2.
Ventilation is not required.
4. If the total or final O2 stop time is :35 or less, a final air break at the :30 mark is not required
Arrive early at the first "D" stop - CORRECT ANSWERS 1. 1st stop is an air stop , begin the
1st stop when the required travel time has been completed
,2. 1st stop is an O2 stop, shift to O2 upon arrival at the stop. Begin stop time when the divers
are confirmed on O2 and the required travel time has been completed .
Delays in arriving at the first "D" stop - CORRECT ANSWERS >:01-Ignore
>:01- Deeper than 50'
a. Round up and add it to the BT and recomputed T/S
b. Perform any missed deeper stops at the current depth, Do no go deeper
>:01- Shallower than 50'
a. round up and add to the diver's first 'D' stop. If between 50' and 40' on a Sur 'D' with no 40'
stop, add delay time to your 50' chamber stop
Delays in leaving or in-between stops - CORRECT ANSWERS >:01 - Ignore
>:01 - Deeper than 50'
a. Round up and add it to the BT and recompute T/S
b. Pick up the new schedule at current stop (leaving) or subsequent stop (in-between)
c. Ignore missed stops
>:01- Shallower than 50'
a. Ignore , resume normal decompression at end of delay
Delays leaving or between the 30' and 20' stop: - CORRECT ANSWERS 1. Subtract delay
from the 20' stop time
2. If delay exceeds :30 , shift the diver to air at the :30 mark
3. When the problem has been resolved , shift the diver back to O2 and resume decompression
4. Ignore any time spent on air
, Cannot shift to O2 at 30' or 20' - CORRECT ANSWERS 1. Corrected quickly
a. Ventilate the diver with O2
b. Complete full O2 stop time
c. Time spent on air is dead time
2. Cannot be corrected- chamber available:
a. Initiate Sur 'D'
b. In this situation , the surface interval for Sur 'D' is the time from leaving the in - water stop to
reaching the 50' stop in the chamber
c. Complete full O2 periods required in the chamber
3. Cannot be corrected -No Chamber available:
a. Continue decompression in the water on air
Loss of O2 at 30' or 20' - CORRECT ANSWERS 1. Shift diver back to air:
2. Corrected quickly:
a. Once corrected shift back to 100% O2
b. Re- ventilate the divers with O2 for :20
c. Resume at the POI
d. Time on air is dead time
3. Cannot be corrected chamber available:
a. Initiate Sur 'D'
b. Complete full O2 periods in the chamber
QUESTIONS AND CORRECT ANSWERS
Safeway Out - CORRECT ANSWERS If only 20' stop in water get to 20'
If 30' stop in the water try to get to 30'
Double the required 02 periods at deepest depth attained.
:60 0n O2 : 15 air break
No repet after safeway out procedure
O2 Toxicity in the chamber on Sur 'D' - CORRECT ANSWERS 1st: 1. off O2
2. Wait til sx subside
3. Wait additional :15
4. Back on O2
2nd: 1. Off O2
2. Wait til sx subside or beathing comfortably
3. Ascend 10' at 1 fpm
4. Resume at point of interruption
3rd: 1. Off o2
2. Complete on air
3. Do air O2 conversion
IN-WATER DCS - CORRECT ANSWERS 1. Launch standby to assist
2. Continue to decompress the other divers according to the original schedule
3. Shift 100% O2 but not if deeper then 40"
4. Descend 10" If significant relief of sx is not obtained, descend additional 10" , but not >40' if
on O2
,5. Remain at tx depth for at least : 30
6. Decompress by multiplying air or O2 stops by 1.5
a.If deeper than 1st stop, insert a stop equal to the 1st stop time
7. If sx free upon surfacing : 100% O2 , TT-5
8. If not sx free upon surfacing : 100% O2, TT-6
Optionally:
1. If less than :05 surface interval, do :30 tx in water then surface and treat as type II in chamber
or
2. Forgo tx in water and surface and treat as Type II in chamber
For all options, observe the diver post tx for at least 6 hours, treat recurrence as Type II
Bottom time in excess of table - CORRECT ANSWERS Immediately contact the NEDU for
advice on how to decompress. If the NEDU cannot be contacted in time, take the following
action:
1. If available , use the U.S.Navy Thaimann Algorithm Dive Planner to compute the
decompression requirement
2. Read down to deeper depths in the Air Decompression Table until a depth is found that has a
schedule that is equal to or longer than the BT and decompress using that T/S.
Air breaks during 30" and 20' O2 stops - CORRECT ANSWERS 1. :30 O2 / :05 air break
2. Air breaks do not count towards required decompression time
3. When an air break is required, shift the console to air for :05 then back to 100% O2.
Ventilation is not required.
4. If the total or final O2 stop time is :35 or less, a final air break at the :30 mark is not required
Arrive early at the first "D" stop - CORRECT ANSWERS 1. 1st stop is an air stop , begin the
1st stop when the required travel time has been completed
,2. 1st stop is an O2 stop, shift to O2 upon arrival at the stop. Begin stop time when the divers
are confirmed on O2 and the required travel time has been completed .
Delays in arriving at the first "D" stop - CORRECT ANSWERS >:01-Ignore
>:01- Deeper than 50'
a. Round up and add it to the BT and recomputed T/S
b. Perform any missed deeper stops at the current depth, Do no go deeper
>:01- Shallower than 50'
a. round up and add to the diver's first 'D' stop. If between 50' and 40' on a Sur 'D' with no 40'
stop, add delay time to your 50' chamber stop
Delays in leaving or in-between stops - CORRECT ANSWERS >:01 - Ignore
>:01 - Deeper than 50'
a. Round up and add it to the BT and recompute T/S
b. Pick up the new schedule at current stop (leaving) or subsequent stop (in-between)
c. Ignore missed stops
>:01- Shallower than 50'
a. Ignore , resume normal decompression at end of delay
Delays leaving or between the 30' and 20' stop: - CORRECT ANSWERS 1. Subtract delay
from the 20' stop time
2. If delay exceeds :30 , shift the diver to air at the :30 mark
3. When the problem has been resolved , shift the diver back to O2 and resume decompression
4. Ignore any time spent on air
, Cannot shift to O2 at 30' or 20' - CORRECT ANSWERS 1. Corrected quickly
a. Ventilate the diver with O2
b. Complete full O2 stop time
c. Time spent on air is dead time
2. Cannot be corrected- chamber available:
a. Initiate Sur 'D'
b. In this situation , the surface interval for Sur 'D' is the time from leaving the in - water stop to
reaching the 50' stop in the chamber
c. Complete full O2 periods required in the chamber
3. Cannot be corrected -No Chamber available:
a. Continue decompression in the water on air
Loss of O2 at 30' or 20' - CORRECT ANSWERS 1. Shift diver back to air:
2. Corrected quickly:
a. Once corrected shift back to 100% O2
b. Re- ventilate the divers with O2 for :20
c. Resume at the POI
d. Time on air is dead time
3. Cannot be corrected chamber available:
a. Initiate Sur 'D'
b. Complete full O2 periods in the chamber
