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Labor Day tech dive


Scuba Diving on the Great Escape Southern California Live-Aboard Dive Boat


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Posted by anon on September 12, 2006 at 09:40:15:

A group of friends and I went on a tech dive trip to Blue Fish Cove at Pt Lobos on Labor Day.

Depth was 180 ft. Total dive time was about 49 minutes per dive (slightly longer deco on the second). Time at MOD was 20 mins per dive. Water temp was 52F. Vis was 15 ft at the surface and 30+ feet at max depth. Bottom mix was TMX 20/40 and deco gasses were EAN 50 and 100% O2.

The views on the underwater pinnacle were stunning, with all of the usual array of anemonies, tunicates, gorgonians, and such covering the pristine rocky reef. We saw canary rock fish, vermillions, and calicos as well. At 180 ft we were hovering at a wall formed by the pinnacle with the bottom at least another 30 feet below us, or so it appeared. Lobos is such a beautiful place, the gem of northern California diving.

Here is the dive plan:

DIVE PLAN #1
Surface interval = 5 day 0 hr 0 min.
Elevation = 0ft
Conservatism = + 3

Dec to 180ft (3) on Trimix 20.0/40.0, 50ft/min descent.
Level 180ft 16:24 (20) on Trimix 20.0/40.0, 1.29 ppO2,
75ft ead, 95ft end
Asc to 100ft (22) on Trimix 20.0/40.0, -30ft/min ascent.
Stop at 100ft 0:20 (23) on Trimix 20.0/40.0, 0.80 ppO2,
34ft ead, 47ft end
Stop at 90ft 1:00 (24) on Trimix 20.0/40.0, 0.74 ppO2,
29ft ead, 41ft end
Stop at 80ft 1:00 (25) on Trimix 20.0/40.0, 0.68 ppO2,
24ft ead, 35ft end
Stop at 70ft 1:00 (26) on Nitrox 50.0, 1.56 ppO2, 32ft ead
Stop at 60ft 1:00 (27) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 2:00 (29) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 3:00 (32) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 4:00 (36) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 2:00 (38) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 11:00 (49) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (49) on Oxygen, -30ft/min ascent.

Off gassing starts at 129ft

OTU's this dive: 67
CNS Total: 28.5%

104.9 cu ft Trimix 20.0/40.0
12.5 cu ft Nitrox 50.0
9.6 cu ft Oxygen
127.1 cu ft TOTAL

DIVE PLAN #2
Surface interval = 0 day 1 hr 0 min.
Elevation = 0ft
Conservatism = + 3

Dec to 180ft (3) on Trimix 20.0/40.0, 50ft/min descent.
Level 180ft 16:24 (20) on Trimix 20.0/40.0, 1.29 ppO2,
75ft ead, 95ft end
Asc to 100ft (22) on Trimix 20.0/40.0, -30ft/min ascent.
Stop at 100ft 0:20 (23) on Trimix 20.0/40.0, 0.80 ppO2,
34ft ead, 47ft end
Stop at 90ft 1:00 (24) on Trimix 20.0/40.0, 0.74 ppO2,
29ft ead, 41ft end
Stop at 80ft 1:00 (25) on Trimix 20.0/40.0, 0.68 ppO2,
24ft ead, 35ft end
Stop at 70ft 1:00 (26) on Nitrox 50.0, 1.56 ppO2, 32ft ead
Stop at 60ft 1:00 (27) on Nitrox 50.0, 1.41 ppO2, 26ft ead
Stop at 50ft 2:00 (29) on Nitrox 50.0, 1.26 ppO2, 20ft ead
Stop at 40ft 3:00 (32) on Nitrox 50.0, 1.10 ppO2, 13ft ead
Stop at 30ft 4:00 (36) on Nitrox 50.0, 0.95 ppO2, 7ft ead
Stop at 20ft 3:00 (39) on Oxygen, 1.60 ppO2, 0ft ead
Stop at 15ft 14:00 (53) on Oxygen, 1.45 ppO2, 0ft ead
Asc to sfc. (53) on Oxygen, -30ft/min ascent.

Off gassing starts at 129ft

OTU's this dive: 74
CNS Total: 50.8%

104.9 cu ft Trimix 20.0/40.0
12.5 cu ft Nitrox 50.0
12.6 cu ft Oxygen
130.1 cu ft TOTAL

DIVE PLAN COMPLETE



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