THEORETICAL DEPTH AT ALTITUDE - IMPERIAL (UPDATED VERSION)
	Surface Atmospheric Pressure (in atm)
	at Various Altitudes (of feet above sea level)
	1,000	2,000	3,000	4,000	5,000	6,000	7,000	8,000	9,000	10,000
	0.9644	0.9298	0.8962	0.8637	0.8320	0.8014	0.7716	0.7428	0.7148	0.6877
Actual
Depth	Theoretical Ocean Depth (in fsw)
(ffw)	at Various Altitudes (of feet above 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	10	11	11	12	12	13	13	14	14
20	20	21	22	23	23	24	25	26	27	28
30	30	31	33	34	35	36	38	39	41	42
40	40	42	43	45	47	49	50	52	54	57
50	50	52	54	56	59	61	63	66	68	71
60	61	63	65	68	70	73	76	79	82	85
70	71	73	76	79	82	85	88	92	95	99
80	81	84	87	90	94	97	101	105	109	113
90	91	94	98	101	105	109	114	118	123	127
100	101	105	109	113	117	122	126	131	136	142
110	111	115	120	124	129	134	139	144	150	156
120	121	126	130	135	140	146	151	157	163	170
130	131	136	141	147	152	158	164	170	177	184
Ocean
Stop
Depth	Safety/Emergency Decompression Stop Depth (in ffw)
(fsw)	at Various Altitudes (of feet above sea level)
	1,000	2,000	3,000	4,000	5,000	6,000	7,000	8,000	9,000	10,000
15	15	14	14	13	13	12	12	11	11	11
20	20	19	18	18	17	16	16	15	15	14