In the tradition of such popular threads as http://www.scubaboard.com/forums/advanced-scuba-discussions/345916-85m-air-dive.html and http://www.scubaboard.com/forums/technical-diving-specialties/297905-psai-narcosis-management-course-73m-air.html, I present my report on my 100m air dive
After spending a week here in Sabang, Philippines doing work up dives @ 30, 40, 50, 55, 65, 75 & 90m, this morning my two dive buddies and I completed a 100m dive on Joshua's Wall.
All dives were done with air as bottom mix in back-mounted doubles, and two deco stages per diver with 50% & 100% 02.
For the last two dives in the series we had support divers - for 100m we had one diver follow us down and level out at 75m, and another diver who came down the SMB line we deployed from 45m. Both support divers had the same equipment/mixes
The 42 minute run-time for the 100m dive was:
Descent phase: 4 minutes
Bottom phase: 4 minutes
Ascent phase: 7 minutes to first stop; 1 minute stop @36m, 1@33, 1@30, 1@27, 1@24, 2@21 (switch to 50%), 1@18, 1@15, 3@12, 3@9, 9@6 (switch to 100%), switch to backgas and 3 minutes to surface
Plan was cut on Decoplanner and run with bottom timer/watch
All the dives were great fun and went pretty much according to plan; most of them were blue water descents - on the final dive it was blue water until ~80m then the site features magically materialised, very cool
I remember the dives well, felt relatively clear-headed for most of them (the 90m dive was the one I felt most narc'd on) and happily I experienced no symptoms of either DCS or OT
Thanks to my buddies, support divers, boat men and shop crew for being part of the fun!
I will probably do a trimix course sometime next year, so it will be interesting to go to the same sites and see the difference the gas makes - better or worse
Feel free to ask relevant questions if you wish
After spending a week here in Sabang, Philippines doing work up dives @ 30, 40, 50, 55, 65, 75 & 90m, this morning my two dive buddies and I completed a 100m dive on Joshua's Wall.
All dives were done with air as bottom mix in back-mounted doubles, and two deco stages per diver with 50% & 100% 02.
For the last two dives in the series we had support divers - for 100m we had one diver follow us down and level out at 75m, and another diver who came down the SMB line we deployed from 45m. Both support divers had the same equipment/mixes
The 42 minute run-time for the 100m dive was:
Descent phase: 4 minutes
Bottom phase: 4 minutes
Ascent phase: 7 minutes to first stop; 1 minute stop @36m, 1@33, 1@30, 1@27, 1@24, 2@21 (switch to 50%), 1@18, 1@15, 3@12, 3@9, 9@6 (switch to 100%), switch to backgas and 3 minutes to surface
Plan was cut on Decoplanner and run with bottom timer/watch
All the dives were great fun and went pretty much according to plan; most of them were blue water descents - on the final dive it was blue water until ~80m then the site features magically materialised, very cool
I remember the dives well, felt relatively clear-headed for most of them (the 90m dive was the one I felt most narc'd on) and happily I experienced no symptoms of either DCS or OT
Thanks to my buddies, support divers, boat men and shop crew for being part of the fun!
I will probably do a trimix course sometime next year, so it will be interesting to go to the same sites and see the difference the gas makes - better or worse
Feel free to ask relevant questions if you wish