(2024 Exam) USN DIVE MAN AIR EP's

Question 1

Delay > :01 deeper than 50fsw?

Answer 1

*Round up the delay time to the next whole minute and add it to the bottom time.
*Recompute table and schedule. Pick up new “D” at current depth. *Perform any deeper stops at current depth. DO NOT GO DEEPER.

Question 2

Delay > :01 shallower than 50fsw?

Answer 2

Round delay up to next whole minute add delay time to the divers first Decompression stop.

Question 3

Delay > :01 leaving air stop or between air stops deeper than 50fsw?

Answer 3

Add delay up to the bottom time and recalculate the required “D”. Pick up any new schedule at the present or subsequent stop if delay occurs between stops. Ignore any missed stops or time deeper than the depth at witch the delay occurred.

Question 4

Delay leaving O2 stop at 30fsw or between O2 stops at 30 and 20fsw.

Answer 4

Subtract delay from subsequent 20fsw O2 time. Take air break after :30 on O2. Ignore any time spent on air.

Question 5

Loss of O2 @ 30 or 20-fsw stop after the divers has been shifted to O2?

Answer 5

• shift diver back to air
• If you get it back quickly, re-vent and Resume @ POI. Consider any time spent on air as dead time
• If chamber avail, Sur “D”. Multiply remaining O2 by 1.1 divide by 30, round up to next half period.
• If the problem can’t be corrected and no recompression chamber avail, continue on air. Compute remaining time on air by multiplying the air/O2 ratio by the remaining air time and rounding up.

Question 6

Contaminated O2 supply?

Answer 6

• Properly align system
• Re-Ventilate each diver for ::20.
• Restart O2 time.

Question 7

CNS O2 tox (Non-Con) @ 30 or 20 FSW?

Answer 7

• Initiate Sur D if Chamber available
• Shift the console to air
• Compute the number of Chamber periods by the 1.1 method.
• If no Chamber and the event occurs @ 30fsw, up 10 & shift. Vent both divers, the affected diver first. Complete “D” @ 20ft. Compute time on O2 @ 20 by multiplying the missed time at 30 by the air/O2 ratio. Add this time to the air time @ 20.
• If the event occurs @ 20fsw, shift to air. Vent both divers, effected first. Complete D at 20fsw by multiplying the remaining stop time by air/O2 ratio.

Question 8

O2 Convulsion @ 30 or 20 FSW?

Answer 8

• Shift Divers to air
• Ventilate, unaffected first then effected.
• If only one Diver launch standby
• Hold Divers at depth until the tonic-clonic phase of the convulsion has subsided.
• Check that the Diver is breathing.
• If he is, hold depth until they are stable, then Sur “D”.
• If Sur “D” is not avail, “D” on air, multiply remaining time by air/O2 ratio.

Question 9

Convulsion @ 20-30fsw, diver is not breathing Or not possible to tell @ end of Clonic/tonic phase?

Answer 9

• Leave the unaffected diver at stop to complete “D”.
• Surface effected and Standby at 30fsw/min. Standby should attempt to maintain airway.
• On Sur, effected diver should receive necessary airway support & be treated for AGE IAW fig 17-1.

Question 10

Type 1 DCS during SUR interval: What is needed to NOT go into a Treat Table and what is the COA?

Answer 10

*Delay neuro until arrive @ 50fsw and on O2.
*If Sx resolve during :15 @ 50fsw, S.I. was :5 or less, and no neuro Sx are found, increase the 50fsw O2 time from 15 to 30 mins, continue normal “D” for the schedule of the dive.

Question 11

In water DCS COA?

Answer 11

1) Splash STBY Diver. Continue to “D” the other diver according or original schedule
2) Switch to O2 if at 30 or 20fsw if available.
3) Descend 10fsw, if no significant relief, descend 10fsw more, NTE 40fsw.
4) Remain @ Tx depth for 30min.
5) Multiply stops by 1.5. Adding a 30fsw if there isn’t one according to original sched by using the 20fsw time and X it by 1.5.
MORE TO THIS EP COVERED IN OTHER CARDS.

Question 12

In water DCS, Diver reaches SUR COA?

Answer 12

If SX free, on O2, transport to chamber, TT5.

If SX, on O2, transport, TT6.