TABLE B: Contingency scenario 1, bottom time 5min longer than planned
Depth (m)	Time (min)	Ambient Pressure (bar)	Gas	Gas Used (litres)
50	35	6	air	4200
Ascend 50 to 18	3	6	air	360
18	2	2.8	air	112
15	5	2.5	air	250
12	7	2.2	air	308
			Total Air (RMV 20 l/min)	5230
9	11	1.9	80%	314
6	5	1.6	80%	120
4.5	26	1.45	80%	566
		Total 80% (RMV 15 l/min)		999