9-52 Change A
U.S. Navy Diving Manual—Volume 2
The planned increase in altitude is 3000 feet. Enter Table 9-5 at 3000 feet and read
down to Repetitive Group K. The diver must delay 6 hours and 25 minutes before
taking the flight.
Table 9-5. Required Surface Interval Before Ascent to Altitude After Diving.
Repetitive
Group
Designator
Increase in Altitude
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
A
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
B
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
2:11
C
0:00
0:00
0:00
0:00
0:00
0:00
0:00
0:00
3:06
8:26
D
0:00
0:00
0:00
0:00
0:00
0:00
0:09
3:28
7:33
12:52
E
0:00
0:00
0:00
0:00
0:00
0:51
3:35
6:54
10:59
16:18
F
0:00
0:00
0:00
0:00
1:12
3:40
6:23
9:43
13:47
19:07
G
0:00
0:00
0:00
1:23
3:34
6:02
8:46
12:05
16:10
21:29
H
0:00
0:00
1:31
3:26
5:37
8:05
10:49
14:09
18:13
23:33
I
0:00
1:32
3:20
5:15
7:26
9:54
12:38
15:58
20:02
24:00
J
1:32
3:09
4:57
6:52
9:04
11:32
14:16
17:35
21:39
24:00
K
3:00
4:37
6:25
8:20
10:32
13:00
15:44
19:03
23:07
24:00
L
4:21
5:57
7:46
9:41
11:52
14:20
17:04
20:23
24:00
24:00
M
5:35
7:11
9:00
10:55
13:06
15:34
18:18
21:37
24:00
24:00
N
6:43
8:20
10:08
12:03
14:14
16:42
19:26
22:46
24:00
24:00
O
7:47
9:24
11:12
13:07
15:18
17:46
20:30
23:49
24:00
24:00
Z
8:17
9:54
11:42
13:37
15:49
18:17
21:01
24:00
24:00
24:00
Exceptional Exposure
Wait 48 hours before flying
NOTE 1 When using Table 9-5, use the highest repetitive group designator obtained in the previous 24-hour
period.
NOTE 2 Table 9-5 may only be used when the maximum altitude achieved is 10,000 feet or less. For ascents
above 10,000 feet, consult NAVSEA 00C for guidance.
NOTE 3 The cabin pressure in commercial aircraft is maintained at a constant value regardless of the actual
altitude of the flight. Though cabin pressure varies somewhat with aircraft type, the nominal value is
8,000 feet. For commercial flights, use a final altitude of 8000 feet to compute the required surface
interval before flying.
NOTE 4 No surface interval is required before taking a commercial flight if the dive site is at 8000 feet or
higher. In this case, flying results in an increase in atmospheric pressure rather than a decrease.
NOTE 5 No repetitive group is given for air dives with surface decompression on oxygen or air. For these sur-
face decompression dives, enter the standard air table with the sea level equivalent depth and bottom
time of the dive to obtain the appropriate repetitive group designator to be used.
NOTE 6 For ascent to altitude following a non-staturation helium-oxygen dive, wait 12 hours if the dive was a
no-decompression dive. Wait 24 hours if the dive was a decompression dive.
