Sandia Snorkel and Scuba, Inc.
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THEORETICAL DIVE DEPTH (fsw) AT VARIOUS ALTITUDES (in feet)
Sea Level 1,000' 2,000' 3,000' 4,000' 5,000' 6,000' 7,000' 8,000' 9,000' 10,000'
0 0 0 0 0 0 0 0 0 0 0
10 10 11 11 12 12 12 13 13 14 15
20 21 21 22 23 24 25 26 27 28 29
30 31 32 33 35 36 37 39 40 42 44
40 41 43 45 46 48 50 52 54 56 58
50 52 54 56 58 60 62 65 67 70 73
60 62 64 67 69 72 75 78 81 84 87
70 72 75 78 81 84 87 91 94 98 102
80 83 86 89 92 96 100 103 108 112 116
90 93 97 100 104 108 112 116 121 126 131
100 103 107 111 116 120 124 129 134 140  
110 114 118 122 127 132 137        
120 124 129 134 139            
130 135 140                
The Imperial version of the Altitude Chart appeared in Skin Diver magazine 1970
It is based on an approximate 4% correction per 1,000 feet altitude
THEORETICAL SAFETY STOPS (fsw) AT VARIOUS ALTITUDES (in feet)
Sea Level 1,000' 2,000' 3,000' 4,000' 5,000' 6,000' 7,000' 8,000' 9,000' 10,000'
15 14 14 13 13 12 12 12 11 11 10
Please Review the Rules for Diving After Arriving at Altitude
Remember the Rules for Travel to Altitude After Diving
Santa Rosa
4,762´		 Heron Lake
7,157´ 		Clines Corners
7,250´ 		Balmorhea, TX
3,205´
Atmospheric pressure at 5,000 feet is approximately 850 mb and at 10,000 feet it is approximately 700 mb
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