Deep diving below 90 m/300 ft Decompression survey

Tom Mount · 24th May 2007, 10:43

Please answer the below only if you do the types of dives listed-we are trying to find answers not provoke curiosity

once we have the answers from people doing these dives then we will be glad to start a discussion on the subject of ultra deep diving

How Guys we trying to determine DCI including MINOR symptoms take place on dives to or below 91 meters (300 fsw)

If you dive with a group such as AUE list all not just your answers- how many are in group

Also what deco models are being followed

What adjustments if any are you making to the deco schedules

Do you do gas switches

do you switch to or use air at any depth

What po2's do you run

Roughly how many dives to these depths have you done

how many annually do you do

Maximum dept and symptoms or no symptoms

OC or CCr

what if any emergencies

What conditions (water tem etc-wreck- cave ) are the dives in?

Andy Del · 24th May 2007, 18:45

Quote: (Originally Posted by Tom Mount)

How Guys we trying to determine DCI including MINOR symptoms take place on dives to or below 91 meters (300 fsw)

If you dive with a group such as AUE list all not just your answers- how many are in group

Can't speak for others I'm afraid, but most are here on the list

Quote:

Also what deco models are being followed

VPMB. Final stop time for VPMB/E are also noted, and plan to be used if the diver feels it necessary.

Quote:

What adjustments if any are you making to the deco schedules

See above. Also, last 10 minutes or so of the 6m stop on OC O2 so a 'more complete' deco is achieved.

Quote:

Do you do gas switches

do you switch to or use air at any depth

No.

Quote:

What po2's do you run

1.3 at depth and on ascent. 1.6 from 6m

Quote:

Roughly how many dives to these depths have you done

1

Quote:

how many annually do you do

like to do lots more

Quote:

Maximum dept and symptoms or no symptoms

120 - slight stiffness in knees post dive for a few minutes.

Quote:

OC or CCr

CC

Quote:

what if any emergencies

none

Quote:

What conditions (water tem etc-wreck- cave ) are the dives in?

[/quote]
wreck, anywhere from 8C to 21C depending on time of year. lasst dive was 19-21C

Mdemon · 24th May 2007, 22:36

Also what deco models are being followed

VR£ v2. Now DecoChek.

What adjustments if any are you making to the deco schedules

Extended deep stops, especially intermediate stops. (Post bendy dive. Prior to that, just extended 6m stop and O2 Rebreather.)

Do you do gas switches

No

do you switch to or use air at any depth

No. Not that posh.

What po2's do you run

1.3 at depth. 1.3 usually except very deep which is 1.5 from 100m upwards. High PO2 in pot means I'm not scared of high PO2 in water now.

Roughly how many dives to these depths have you done

Not a lot.

how many annually do you do

Not many >100m

Maximum dept and symptoms or no symptoms

130m max. None. Got bent to buggery on a 90m dive though. Tingling in fingers before changing conservatism on VR£ to 20%, post-bend - this on dives >2hrs. (On advice from Mark Ellyatt. Thanks Mark)
OC or CCr

CCR. OC is too retro.

what if any emergencies

Bent to buggery on a 90m dive. Suit flood, so no time for padding. 0% conservatism on VR£ v2. Profile perfect. IWR stopped further damage. 11 pot sessions and I could walk OK with my eyes shut. Small, almost invisible brain lesion in swede. Detected with sharpened Rhomburg, otherwise only denial, fatigue and laziness (sub-clinical) symptoms. Since then, 20% on v2 VR£ and all well. All profiles checked using DecoChek first. Since then, no probs.

What conditions (water tem etc-wreck- cave ) are the dives in?[/quote]

Bendy dive in 6oC. Most of the deep stuff since in clear, 21+oC water.

How's that?

Juz · 24th May 2007, 23:19

Also what deco models are being followed
VR3 padded (20) and checked against various models for sanity

What adjustments if any are you making to the deco schedules
10m per min upto 50m then 5m/min thereafter. Deep stops from 50m up increased to 3 mins. Clear VR3 add 10 mins. Last 20 mins on 100%.

Do you do gas switches
No. Absolutely not.

do you switch to or use air at any depth
No. Absolutely not. Helium all the way up.

What po2's do you run
Depends on run time. 1.3 all the way if possible.

Roughly how many dives to these depths have you done
2. One cold water and one warm water.

how many annually do you do
Likely to be 2-5 PA

Maximum dept and symptoms or no symptoms
101m. None.

OC or CCr
CCR

what if any emergencies
None

What conditions (water tem etc-wreck- cave ) are the dives in?
Quarry cold water. Blue Hole Dahab warm water.

Juz

gtzavelas · 25th May 2007, 07:04

what deco models are being followed
deco planner 30/85 for the OC dives and now RGBM +1 with HS explorer for the pSCR

What adjustments if any are you making to the deco schedules
10 more mins of O2 at 6m stop in the cold water dives

Do you do gas switches
yes(its a pSCR!)

do you switch to or use air at any depth
no
What po2's do you run
not applicable (OC + pSCR).

Roughly how many dives to these depths have you done
5

how many annually do you do
1-2
Maximum dept and symptoms or no symptoms

max 101, no symptoms
OC or CCr
3 on OC + 2 on pSCR

what if any emergencies
none

What conditions (water tem etc-wreck- cave ) are the dives in?
4 on open water 15-17degC , the last one in 11 degC cave

gathan · 25th May 2007, 11:52

Quote: (Originally Posted by Tom Mount)

Also what deco models are being followed
RGBM

What adjustments if any are you making to the deco schedules
Padded some of the shallow stops

Do you do gas switches
No

do you switch to or use air at any depth
No

What po2's do you run
1.0 on bottom / anywhere from 1.2 to 1.6 on deco

Roughly how many dives to these depths have you done
1

how many annually do you do
1-2

Maximum dept and symptoms or no symptoms
94m / no symptoms

OC or CCr
CCR

what if any emergencies
None

What conditions (water tem etc-wreck- cave ) are the dives in?

5C on bottom / 15C shallow

Andre

jean-marc · 25th May 2007, 13:40

deco model : Bühlmann & gf (apdiving vision integrated deco) for these deep dives, gf 10/90

no adjustment, but very slow ascent (even during the deep part)

no gas switch except oxygen flush at 6m
usually, very high CNS%, but doesn't seem very important.
only one diluent Tx10/70 from surface till 120m

PO2 = 1.3b

15 dives OC > 90m
40 dives CCR > 90m

10 dives/years > 90m, only CCR now

max depth : 142m (diluent Tx 8/80)
no symptom

If emergency : part of the bailout is carried by the diver (just enough for the deep part), then bailout gas on the short line (10 litres at 30m and oxygen at 6m) and also surface support team with spare gas.

cave dives t° between 9 and 13c°
sea dives between 13 and 20c°

Tom, don't you forget to ask about the diluent ? Seems to be an important information.

n2diving · 25th May 2007, 22:46

Four recent dives for Lisa and myself at the 300 fsw range.
Dives were made on Heliair 6/70

Also what deco models are being followed
VPM-B/E on VR3

What adjustments if any are you making to the deco schedules

Staying significantly below ceiling (10 to 20 fsw) for last few stops.
Very, Very slow ascent last 20 fsw, usually adding 2 to 5 minutes to
total runtime.

Do you do gas switches
No

do you switch to or use air at any depth
No

What po2's do you run

Approx 1.0 on descent to 100 - 150 fsw, gradually increasing to between 1.2 and 1.3 at max depth... then 1.1 to 1.2 during ascent and early stops... and then 1.3 to 1.4 at 20 fsw. Dives were at approximately 80 to 85% of %CNS

Roughly how many dives to these depths have you done
Recently, four on CCR for Lisa and myself
(personally many more for me when OC, but it's been a while)

how many annually do you do

see above..

Maximum dept and symptoms or no symptoms

300 fsw and no overt symptoms or niggles... minor fatigue, but more than
would have expected. Both of us wanted afternoon naps, significantly
unusual for us.

OC or CCr
CCR

what if any emergencies
None

What conditions (water tem etc-wreck- cave ) are the dives in?
The dives were walls in Cayman, 82 degree water, minor effort, no current.
Observed that we were consistently last divers out of water, most others
were following Bulhumann VR3 and exiting 10 to 20 minutes earlier.

GKAM · 26th May 2007, 05:36

what deco models are being followed
Buhlmann and DecoPlanner 30/85 in the past. Now use ExpSim RGBM CF1

What adjustments if any are you making to the deco schedules
Padding 9m and O2 stops with approx. 10-15min total extra hang time.

Do you do gas switches
Yes. I have only dived OC at these depths

do you switch to or use air at any depth
No, but I have done two 90m+ plus one 100m dives on air when I was younger and stupid.

What po2's do you run
N/A

Roughly how many dives to these depths have you done
7

how many annually do you do
1-2

Maximum dept and symptoms or no symptoms
max 103m, no symptoms

OC or CCr
all OC

what if any emergencies
none

What conditions (water tem etc-wreck- cave ) are the dives in?
all open water, 14C min temp at bottom. Usually 19-23C from 20m up

Captain Nemo · 27th May 2007, 19:14

Hope This Helps Tom.

what deco models are being followed APD VISION GF 90-98 Before that custom tables.

What adjustments if any are you making to the deco schedules Air Switch at 40 metres

Do you do gas switches ......Only on the computer

do you switch to or use air at any depth .....No

What po2's do you run ......1.30

Roughly how many dives to these depths have you done... 500

how many annually do you do.... 50-80

Maximum depth and symptoms or no symptoms 120....None

OC or CCr..... CCR

what if any emergencies ...None

What conditions (water tem etc-wreck- cave ) are the dives in? Wreck 6-21 centigrade

24th May 2007, 10:43	#1 (permalink)
Tom Mount New Member Current Rebreather/s: Inspiration Classic Evolution Megalodon Sport Kiss Classic Kiss Optima Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: USA Posts: 96	Deep diving below 90 m/300 ft Decompression survey Please answer the below only if you do the types of dives listed-we are trying to find answers not provoke curiosity once we have the answers from people doing these dives then we will be glad to start a discussion on the subject of ultra deep diving How Guys we trying to determine DCI including MINOR symptoms take place on dives to or below 91 meters (300 fsw) If you dive with a group such as AUE list all not just your answers- how many are in group Also what deco models are being followed What adjustments if any are you making to the deco schedules Do you do gas switches do you switch to or use air at any depth What po2's do you run Roughly how many dives to these depths have you done how many annually do you do Maximum dept and symptoms or no symptoms OC or CCr what if any emergencies What conditions (water tem etc-wreck- cave ) are the dives in?
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24th May 2007, 18:45	#2 (permalink)
Andy Del Classic KISSer Current Rebreather/s: Sport Kiss Classic Kiss Other Rebreather/s: Join Date: Feb 2005 Location: Australia, Sunny Sydney Posts: 421	Re: Deep diving below 90 m/300 ft Decompression survey Quote: (Originally Posted by Tom Mount) How Guys we trying to determine DCI including MINOR symptoms take place on dives to or below 91 meters (300 fsw) If you dive with a group such as AUE list all not just your answers- how many are in group Can't speak for others I'm afraid, but most are here on the list Quote: Also what deco models are being followed VPMB. Final stop time for VPMB/E are also noted, and plan to be used if the diver feels it necessary. Quote: Quote: What adjustments if any are you making to the deco schedules See above. Also, last 10 minutes or so of the 6m stop on OC O2 so a 'more complete' deco is achieved. Quote: Quote: Do you do gas switches do you switch to or use air at any depth No. Quote: Quote: What po2's do you run 1.3 at depth and on ascent. 1.6 from 6m Quote: Quote: Roughly how many dives to these depths have you done 1 Quote: Quote: how many annually do you do like to do lots more Quote: Quote: Maximum dept and symptoms or no symptoms 120 - slight stiffness in knees post dive for a few minutes. Quote: Quote: OC or CCr CC Quote: Quote: what if any emergencies none Quote: Quote: What conditions (water tem etc-wreck- cave ) are the dives in? [/quote] wreck, anywhere from 8C to 21C depending on time of year. lasst dive was 19-21C __________________ Yellow - the colour of greatness!
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24th May 2007, 22:36	#3 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,931	Re: Deep diving below 90 m/300 ft Decompression survey Also what deco models are being followed VR£ v2. Now DecoChek. What adjustments if any are you making to the deco schedules Extended deep stops, especially intermediate stops. (Post bendy dive. Prior to that, just extended 6m stop and O2 Rebreather.) Do you do gas switches No do you switch to or use air at any depth No. Not that posh. What po2's do you run 1.3 at depth. 1.3 usually except very deep which is 1.5 from 100m upwards. High PO2 in pot means I'm not scared of high PO2 in water now. Roughly how many dives to these depths have you done Not a lot. how many annually do you do Not many >100m Maximum dept and symptoms or no symptoms 130m max. None. Got bent to buggery on a 90m dive though. Tingling in fingers before changing conservatism on VR£ to 20%, post-bend - this on dives >2hrs. (On advice from Mark Ellyatt. Thanks Mark) OC or CCr CCR. OC is too retro. what if any emergencies Bent to buggery on a 90m dive. Suit flood, so no time for padding. 0% conservatism on VR£ v2. Profile perfect. IWR stopped further damage. 11 pot sessions and I could walk OK with my eyes shut. Small, almost invisible brain lesion in swede. Detected with sharpened Rhomburg, otherwise only denial, fatigue and laziness (sub-clinical) symptoms. Since then, 20% on v2 VR£ and all well. All profiles checked using DecoChek first. Since then, no probs. What conditions (water tem etc-wreck- cave ) are the dives in?[/quote] Bendy dive in 6oC. Most of the deep stuff since in clear, 21+oC water. How's that?
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24th May 2007, 23:19	#4 (permalink)
Juz Team Kinky Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: London UK Posts: 147	Re: Deep diving below 90 m/300 ft Decompression survey Also what deco models are being followed VR3 padded (20) and checked against various models for sanity What adjustments if any are you making to the deco schedules 10m per min upto 50m then 5m/min thereafter. Deep stops from 50m up increased to 3 mins. Clear VR3 add 10 mins. Last 20 mins on 100%. Do you do gas switches No. Absolutely not. do you switch to or use air at any depth No. Absolutely not. Helium all the way up. What po2's do you run Depends on run time. 1.3 all the way if possible. Roughly how many dives to these depths have you done 2. One cold water and one warm water. how many annually do you do Likely to be 2-5 PA Maximum dept and symptoms or no symptoms 101m. None. OC or CCr CCR what if any emergencies None What conditions (water tem etc-wreck- cave ) are the dives in? Quarry cold water. Blue Hole Dahab warm water. Juz __________________ ~KINKY DIVERS~ Because going down is fun We are all prompted by the same motives, all deceived by the same fallacies, all animated by hope, obstructed by danger, entangled by desire and seduced by pleasure. Welcome to Kinky Divers!
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25th May 2007, 07:04	#5 (permalink)
gtzavelas Rebreather World Writer Current Rebreather/s: Megalodon RB80 / Clone Other Rebreather/s: RB80 / Clone Join Date: Jan 2006 Location: Athens,Greece Posts: 261	Re: Deep diving below 90 m/300 ft Decompression survey what deco models are being followed deco planner 30/85 for the OC dives and now RGBM +1 with HS explorer for the pSCR What adjustments if any are you making to the deco schedules 10 more mins of O2 at 6m stop in the cold water dives Do you do gas switches yes(its a pSCR!) do you switch to or use air at any depth no What po2's do you run not applicable (OC + pSCR). Roughly how many dives to these depths have you done 5 how many annually do you do 1-2 Maximum dept and symptoms or no symptoms max 101, no symptoms OC or CCr 3 on OC + 2 on pSCR what if any emergencies none What conditions (water tem etc-wreck- cave ) are the dives in? 4 on open water 15-17degC , the last one in 11 degC cave
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25th May 2007, 11:52	#6 (permalink)
gathan MixedGas Current Rebreather/s: Classic Kiss Other SCR Other Rebreather/s: Other SCR Join Date: Sep 2005 Location: Tottenham, Ontario, Canada Posts: 202	Re: Deep diving below 90 m/300 ft Decompression survey Quote: (Originally Posted by Tom Mount) Also what deco models are being followed RGBM What adjustments if any are you making to the deco schedules Padded some of the shallow stops Do you do gas switches No do you switch to or use air at any depth No What po2's do you run 1.0 on bottom / anywhere from 1.2 to 1.6 on deco Roughly how many dives to these depths have you done 1 how many annually do you do 1-2 Maximum dept and symptoms or no symptoms 94m / no symptoms OC or CCr CCR what if any emergencies None What conditions (water tem etc-wreck- cave ) are the dives in? 5C on bottom / 15C shallow Andre
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25th May 2007, 13:40	#7 (permalink)
jean-marc New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Inspiration Vision Join Date: Jan 2006 Location: Montpellier - France Posts: 59	Re: Deep diving below 90 m/300 ft Decompression survey deco model : Bühlmann & gf (apdiving vision integrated deco) for these deep dives, gf 10/90 no adjustment, but very slow ascent (even during the deep part) no gas switch except oxygen flush at 6m usually, very high CNS%, but doesn't seem very important. only one diluent Tx10/70 from surface till 120m PO2 = 1.3b 15 dives OC > 90m 40 dives CCR > 90m 10 dives/years > 90m, only CCR now max depth : 142m (diluent Tx 8/80) no symptom If emergency : part of the bailout is carried by the diver (just enough for the deep part), then bailout gas on the short line (10 litres at 30m and oxygen at 6m) and also surface support team with spare gas. cave dives t° between 9 and 13c° sea dives between 13 and 20c° Tom, don't you forget to ask about the diluent ? Seems to be an important information.
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25th May 2007, 22:46	#8 (permalink)
n2diving Custom Title Allowed! Current Rebreather/s: Optima Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Feb 2005 Location: Florida, USA Posts: 271	Re: Deep diving below 90 m/300 ft Decompression survey Four recent dives for Lisa and myself at the 300 fsw range. Dives were made on Heliair 6/70 Also what deco models are being followed VPM-B/E on VR3 What adjustments if any are you making to the deco schedules Staying significantly below ceiling (10 to 20 fsw) for last few stops. Very, Very slow ascent last 20 fsw, usually adding 2 to 5 minutes to total runtime. Do you do gas switches No do you switch to or use air at any depth No What po2's do you run Approx 1.0 on descent to 100 - 150 fsw, gradually increasing to between 1.2 and 1.3 at max depth... then 1.1 to 1.2 during ascent and early stops... and then 1.3 to 1.4 at 20 fsw. Dives were at approximately 80 to 85% of %CNS Roughly how many dives to these depths have you done Recently, four on CCR for Lisa and myself (personally many more for me when OC, but it's been a while) how many annually do you do see above.. Maximum dept and symptoms or no symptoms 300 fsw and no overt symptoms or niggles... minor fatigue, but more than would have expected. Both of us wanted afternoon naps, significantly unusual for us. OC or CCr CCR what if any emergencies None What conditions (water tem etc-wreck- cave ) are the dives in? The dives were walls in Cayman, 82 degree water, minor effort, no current. Observed that we were consistently last divers out of water, most others were following Bulhumann VR3 and exiting 10 to 20 minutes earlier.
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26th May 2007, 05:36	#9 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 252	Re: Deep diving below 90 m/300 ft Decompression survey what deco models are being followed Buhlmann and DecoPlanner 30/85 in the past. Now use ExpSim RGBM CF1 What adjustments if any are you making to the deco schedules Padding 9m and O2 stops with approx. 10-15min total extra hang time. Do you do gas switches Yes. I have only dived OC at these depths do you switch to or use air at any depth No, but I have done two 90m+ plus one 100m dives on air when I was younger and stupid. What po2's do you run N/A Roughly how many dives to these depths have you done 7 how many annually do you do 1-2 Maximum dept and symptoms or no symptoms max 103m, no symptoms OC or CCr all OC what if any emergencies none What conditions (water tem etc-wreck- cave ) are the dives in? all open water, 14C min temp at bottom. Usually 19-23C from 20m up __________________ Stay #
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27th May 2007, 19:14	#10 (permalink)
Captain Nemo New Member Current Rebreather/s: Evolution Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Evolution Megalodon Sport Kiss Classic Kiss Join Date: Oct 2006 Location: End of the known world Posts: 51	Re: Deep diving below 90 m/300 ft Decompression survey Hope This Helps Tom. what deco models are being followed APD VISION GF 90-98 Before that custom tables. What adjustments if any are you making to the deco schedules Air Switch at 40 metres Do you do gas switches ......Only on the computer do you switch to or use air at any depth .....No What po2's do you run ......1.30 Roughly how many dives to these depths have you done... 500 how many annually do you do.... 50-80 Maximum depth and symptoms or no symptoms 120....None OC or CCr..... CCR what if any emergencies ...None What conditions (water tem etc-wreck- cave ) are the dives in? Wreck 6-21 centigrade
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