Here is my standard deco plan to 150 ft, with contingencies.
I have used this one many times, and it works.
Deco plans are meant to be followed. Not abbreviated.
Now, what was it that you were asking about??
150 FT 20 MINS TMX 25 / 35 +3 ALL EVENTS / NO FAILURES
V-Planner 3.43 by R. Hemingway, VPM code by Erik C. Baker.
Decompression model: VPM-B
DIVE PLAN #1
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Asc to 60ft (23) on Nitrox 50.0, -30ft/min ascent.
Stop at 60ft 1:00 (24) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 1:00 (25) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 1:00 (26) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 2:00 (28) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 1:00 (29) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 7:00 (36) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (36) on Oxygen, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 54
CNS Total: 22.4%
86.6 cu ft Trimix 25.0/35.0
7.5 cu ft Nitrox 50.0
5.9 cu ft Oxygen
100 cu ft TOTAL
DIVE PLAN #2
Surface interval = 0 day 2 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Asc to 60ft (23) on Nitrox 50.0, -30ft/min ascent.
Stop at 60ft 1:00 (24) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 1:00 (25) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 1:00 (26) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 2:00 (28) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 2:00 (30) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 8:00 (38) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (38) on Oxygen, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 58
CNS Total: 39.4%
86.6 cu ft Trimix 25.0/35.0
7.5 cu ft Nitrox 50.0
7.5 cu ft Oxygen
101.5 cu ft TOTAL
DIVE PLAN COMPLETE
150 FT 20 MINS TMX 25 / 35 +3 / FAILURE OF EAN 50 BOTTLE
DIVE PLAN #1
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Stop at 70ft 0:20 (23) on Trimix 25.0/35.0, 0.78 ppO2, 19ft ead, 34ft end
Stop at 60ft 1:00 (24) on Trimix 25.0/35.0, 0.70 ppO2, 14ft ead, 27ft end
Stop at 50ft 1:00 (25) on Trimix 25.0/35.0, 0.63 ppO2, 9ft ead, 21ft end
Stop at 40ft 3:00 (28) on Trimix 25.0/35.0, 0.55 ppO2, 4ft ead, 14ft end
Stop at 30ft 4:00 (32) on Trimix 25.0/35.0, 0.48 ppO2, 0ft ead, 8ft end
Stop at 20ft 2:00 (34) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 7:00 (41) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (41) on Oxygen, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 50
CNS Total: 22.8%
97.6 cu ft Trimix 25.0/35.0
6.7 cu ft Oxygen
104.3 cu ft TOTAL
DIVE PLAN #2
Surface interval = 0 day 2 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Asc to 60ft (23) on Nitrox 50.0, -30ft/min ascent.
Stop at 60ft 1:00 (24) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 1:00 (25) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 1:00 (26) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 2:00 (28) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 1:00 (29) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 8:00 (37) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (37) on Oxygen, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 56
CNS Total: 37.5%
86.6 cu ft Trimix 25.0/35.0
7.5 cu ft Nitrox 50.0
6.7 cu ft Oxygen
100.7 cu ft TOTAL
DIVE PLAN COMPLETE
150 FT 20 MINS TMX 25 / 35 +3 / FAILURE OF 100% O2 BOTTLE
DIVE PLAN #1
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Stop at 70ft 0:20 (23) on Nitrox 50.0, 1.56 ppO2, 32ft ead
Stop at 60ft 1:00 (24) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 1:00 (25) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 1:00 (26) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 2:00 (28) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 2:00 (30) on Nitrox 50.0, 0.80 ppO2, 1ft ead
Stop at 15ft 10:00 (40) on Nitrox 50.0, 0.73 ppO2, 0ft ead
Asc to sfc. (40) on Nitrox 50.0, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 47
CNS Total: 18.0%
86.6 cu ft Trimix 25.0/35.0
15.8 cu ft Nitrox 50.0
102.4 cu ft TOTAL
DIVE PLAN #2
Surface interval = 0 day 2 hr 0 min.
Elevation = 0ft
Conservatism = + 3
Dec to 150ft (3) on Trimix 25.0/35.0, 50ft/min descent.
Level 150ft 17:00 (20) on Trimix 25.0/35.0, 1.38 ppO2, 60ft ead, 86ft end
Asc to 70ft (22) on Trimix 25.0/35.0, -30ft/min ascent.
Asc to 60ft (23) on Nitrox 50.0, -30ft/min ascent.
Stop at 60ft 1:00 (24) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 1:00 (25) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 1:00 (26) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 2:00 (28) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 1:00 (29) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 9:00 (38) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (38) on Oxygen, -30ft/min ascent.
Off gassing starts at 97.1ft
OTU's this dive: 57
CNS Total: 35.1%
86.6 cu ft Trimix 25.0/35.0
7.5 cu ft Nitrox 50.0
7.4 cu ft Oxygen
101.5 cu ft TOTAL
DIVE PLAN COMPLETE