Table 3. Summary of the S. Suraksha emergency decompression; BIBS – built in breathing system; FO₂ – inspired fraction of oxygen; LST – life support technician; msw – metres of seawater; PO₂ – inspired pressure of oxygen; USN – United States Navy .

Depth (msw)	Breathing gas	Ascent rate (msw·h-1)	Comments
Initially 28 and 42, compressed to 85 msw			Two separate teams of divers compressed to deepest operating depth in the area
85–54 msw	Chamber gas (heliox) FO2 = 6% (uncertain)	˜ 4–5 msw·h-1	Empirical decompression carried out by the divers
54–34 msw	Chamber gas FO2 = 8–12%	2.50 msw·h-1	Decompression during the night, under the control of the LSTs on site. No power, no scrubber, divers on emergency rebreather
34 msw	Chamber gas FO2 = 12%	Hold	Eight hour hold decided by Dr Kulkarni
34–23 msw	Chamber gas FO2 = 16%	1.20 msw·h-1	Standard decompression under the control of LSTs
23–11 msw	Chamber gas PO2 = 60 kPa	3.00 msw·h-1	Decompression performed by the divers
11 msw	Chamber gas FO2 = 20%	Hold	Decision to transfer. Stop for 45 min waiting on the S. Prabha to prepare for divers’ reception
11–2.4 msw	BIBS FO2 = 100%	1.00 msw·min-1	8.6 min from 11 to 2.4 msw
2.4–1 msw	BIBS FO2 = 100%	0.16 msw·min-1	10 min from 2.4 to 1 msw
1 msw to surface	BIBS FO2 = 100%	0.08 msw·min-1	12 min from 1 msw to surface
Surface			Divers transferred to the S. Prabha
Recompression to 30 msw in less than 30 min			One case of knee pain in one diver relieved on arrival at 30 msw
30 msw to surface		USN heliox saturation diving decompression schedule	No DCS symptoms reported