Forgot my computer: no depth or pressure gauge

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crispix

Contributor
Scuba Instructor
Divemaster
Messages
161
Reaction score
12
Location
San Diego, California, United States
# of dives
200 - 499
The question is: what would you have done?

Went diving today with my regular buddy. We're both good divers, practice skills occasionally, conservative plans, etc.

Gearing up today, I realized I had forgotten my air-integrated computer. I did not have my backup SPG on a hose. I did have my pony bottle and pony reg that has a tiny pressure gauge attached to the first stage.

After some discussion, we came up with the following plan:

1. We would still dive, but instead of our planned dive a bit deeper, we'd stick to the "wall" at LJ Shores. I'm very familiar with this dive. San Diego divers will know all about it. I can estimate depth within 5 ft on this dive, and look at my buddy's gauge for confirmation.

2. I checked my pony pressure, and then moved the tiny pressure gauge to my main regulator's 1st stage. I would not be able to see my own pressure, but my buddy could check it for me periodically by looking at my first stage.

3. I'd wear a watch so I'd have an idea of how much time had passed. I do this dive so often, I will have a good estimate of my pressure from time elapsed.

4. Buddy would watch my pressure by looking at my first stage, tell me from time to time, and the moment I hit 1500psi on my LP95, we'd head in. This is conservative: I only need 300-400 psi for a nice leisurely swim up the slope to the beach.

5. If, by some misfortune, I was able to run out of air, I had a pony tank with 19CF right there. I'd switch regs, thumb the dive, and he'd be ready to donate if necessary. I'd have to orally inflate at the surface, of course.

6. If he ran into trouble of any kind, he also has a pony, and I still had an octo and pony, and we'd react accordingly and thumb the dive. We've practiced air sharing on this dive plan recently, coincidentally.

7. I was not going to worry about my NDL or repetitive diving tables: I had a nitrox mix, max depth was ~65ft, and no plans to do a second dive within 24 hours.

So after all that planning, I switch my pressure gauge around, tools and everything, continue to gear up and guess what falls out of my bootie when I start to suit up? My *&%!ing computer!

So I switch everything back and I dive normally. I'm such a dork.

But . . . this got me thinking. I'm completely comfortable with my plan to dive without having my depth and pressure gauge right there. I would not have done the dive if my regular trusted buddy was not there, and there's no way I'd have done this with my less experienced buddies or someone I did not know as well.

So I realize this plan is not for everyone, and I expect some responses telling me I'm gonna die, and others saying "no big deal". Still, what would you have done?

Post script to this story: so after switching everything back and gearing up, I realized just before entering the water, when doing our final buddy check, that I had not turned on my air. This is the first time I can remember ever failing a buddy check, and it was due to the whole fiasco of switching my gear around twice. Moral of the story: always do a buddy check. It saved me from either embarrassment, injury, or worse today.
 
The question is: what would you have done?

Hmmm...difficult question.

As we are all aware, to conduct a dive without a proper SPG or depth gauge is contrary to every bit of scuba training and education you have recieved.

Scuba divers love diving...we are passionate about it... and that makes it very hard for us to make 'tough' decisions to abort/cancel dives, when our common sense and training tell us to do so.

As we gain more experience and confidence underwater, these little temptations to cut corners and ignore the basic 'golden rules' slowly build up until, eventually breaking the rules becomes the norm. Every time we get away with it, the 'legitimacy' of our decisions is reinforced.... up until the point that something goes wrong and we are reminded exactly how much we are putting our lives in jeapordy.

Having said that..... it is possible to dive without a depth gauge.... IF you are familiar with the site concerned and have an awareness of the depth you are at, by recognition. Even better, if you know the max depth of a site, you can just plan your dive on tables (square profile) and use your watch to maintain your bottom time. The only difficulty arises on ascent - for monitoring speed and safety stop. We can rely on our buddy for helping with that - but that sort of reliance is contrary to everything we should be doing underwater.

Not having an accessable SPG is a much more serious matter. Even using a button gauge (monitored by buddy) is not really sufficient. Given the safety measures and training available to divers, I often find it amazing that people manage to have OOA emergencies. It is exactly this sort of corner-cutting that makes OOA accidents a possibility.

I may be a hypocrite for saying this, because I've taken some stupid short-cuts myself just to avoid missing dives, but the OPs 'plan' really is just a combination of complacency and weak justification for breaking the cardinal rules of diving. We all do it occasionally...which is why some of our underwater community die in silly and preventable accidents every month.

If you want to stay, truly, safe underwater - it is essential that you apply strict standards to yourself...and be aware that the temptation to break those standards will arise regularly. The more times you take silly chances, the more chance you allow the 'law of averages' to catch up with you....and turn you into another statistic.

The common theme with serious accidents, whether diving or driving or domestic or whatever, is that the person involved never believed that it would happen to them.

It can....and the more chances you take, the more likelihood it will.

The best way to prevent this situation happening in the first instance, is to build yourself a robust 'save-a-dive' kit (maybe including a spare spg/depth gauge in a consol, that can be easily substituted into your kit in the event that your computer lets your down). Plan your redundancy and contingencies - both for in-water (during dive) and out-of-water (pre-dive) problems.
 
Since you asked, I would have loaded up and headed to the bar to talk about how much of an idiot I am. I can envision a dive I've done dozens of times, similar to what you described, but I would've been to wracked with guilt/paranoia to enjoy it being so ill-prepared.
 
I wouldn't dive without an SPG and a depth gauge. This wouldn't happen to me unless I forgot my regulator. I wouldn't have a regulator without an SPG and depth gauge A computer is a nice extra, but not necessary. The SPG and depth gauge never get left behind. Where were your tables?

DevonDiver:
I've taken some stupid short-cuts myself just to avoid missing dives

So have I. From time to time, those short cuts have slapped me around a bit. On dive 760, the practice of taking short cuts nearly killed me. I was lucky to survive. It's a lesson I took to heart. I don't take short cuts any more.
 
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The Divemaster in me says the dive is cancelled. But if I am being completely honest with myself, I know that I most likely would have done the dive in the conditions you described. I have done dives with only a watch and SPG on a site where I knew the maximum depth. I checked the dive tables and restricted my bottom time to half my NDL. In the situation you described, being aware of your bottom time and depth, plus with a buddy to double check with, and him able to monitor your actual pressure, doesn't sound too bad. I think of people diving with the old "J" valve tanks and this doesn't sound any worse- I will probably get flamed for this, but I'll take the punishment for my honesty.
 
The question is: what would you have done?

Went diving today with my regular buddy. We're both good divers, practice skills occasionally, conservative plans, etc.

Gearing up today, I realized I had forgotten my air-integrated computer. I did not have my backup SPG on a hose. I did have my pony bottle and pony reg that has a tiny pressure gauge attached to the first stage.

After some discussion, we came up with the following plan:

1. We would still dive, but instead of our planned dive a bit deeper, we'd stick to the "wall" at LJ Shores. I'm very familiar with this dive. San Diego divers will know all about it. I can estimate depth within 5 ft on this dive, and look at my buddy's gauge for confirmation.

2. I checked my pony pressure, and then moved the tiny pressure gauge to my main regulator's 1st stage. I would not be able to see my own pressure, but my buddy could check it for me periodically by looking at my first stage.

3. I'd wear a watch so I'd have an idea of how much time had passed. I do this dive so often, I will have a good estimate of my pressure from time elapsed.

4. Buddy would watch my pressure by looking at my first stage, tell me from time to time, and the moment I hit 1500psi on my LP95, we'd head in. This is conservative: I only need 300-400 psi for a nice leisurely swim up the slope to the beach.

5. If, by some misfortune, I was able to run out of air, I had a pony tank with 19CF right there. I'd switch regs, thumb the dive, and he'd be ready to donate if necessary. I'd have to orally inflate at the surface, of course.

6. If he ran into trouble of any kind, he also has a pony, and I still had an octo and pony, and we'd react accordingly and thumb the dive. We've practiced air sharing on this dive plan recently, coincidentally.

7. I was not going to worry about my NDL or repetitive diving tables: I had a nitrox mix, max depth was ~65ft, and no plans to do a second dive within 24 hours.

So after all that planning, I switch my pressure gauge around, tools and everything, continue to gear up and guess what falls out of my bootie when I start to suit up? My *&%!ing computer!

So I switch everything back and I dive normally. I'm such a dork.

But . . . this got me thinking. I'm completely comfortable with my plan to dive without having my depth and pressure gauge right there. I would not have done the dive if my regular trusted buddy was not there, and there's no way I'd have done this with my less experienced buddies or someone I did not know as well.

So I realize this plan is not for everyone, and I expect some responses telling me I'm gonna die, and others saying "no big deal". Still, what would you have done?

Post script to this story: so after switching everything back and gearing up, I realized just before entering the water, when doing our final buddy check, that I had not turned on my air. This is the first time I can remember ever failing a buddy check, and it was due to the whole fiasco of switching my gear around twice. Moral of the story: always do a buddy check. It saved me from either embarrassment, injury, or worse today.
Of course technically this could be considered a "bad idea" and if anything happened you would look like an idiot.

That said, considering all the steps you've listed and assuming your buddy would have been dilligent in checking your SPG, it sounds relatively safe. When you combine buddy checking pressure, you having a rough idea of remaining air based on time, and a very conservative time to surface, it seems very unlikely you'd had an OOA situation. And even if you did, you had a pony on you.

Tough call, don't think I'd do it, but I guess the safety of the whole thing really comes down to your buddy taking on the extra responsibility to check your air.
 
I would not have dived. I have no doubt your plan would have worked but the potential problems are just not worth the risk.
I prefer an old fashioned pressure guage rather than integrated (so long as I remember my regs I've remembered the guage!) and I dont have to worry about batteries.
 
Umm, 40 years ago most divers had no SPG. And depth was pretty much an eyeball thing.Be smart.

I would have no problem with it. As long as it is within rec limits.

We are WAY overdependent on computers, and this from a guy who makes his living on system administration.

Use your brain.
 
On a side note, speaking of J valves and all. I wish there was some way to show new divers how exhausting a tank at 100' and then surfacing, they would get extra breaths. If you are OOA at depth, as you ascend you do get more air.

Actually I used to do this, when the air ran out, I knew I had more as I came up

DISCLAIMER:: I was an idiot, but still alive.
 
Umm, 40 years ago most divers had no SPG. And depth was pretty much an eyeball thing.Be smart.

I would have no problem with it. As long as it is within rec limits.

We are WAY overdependent on computers, and this from a guy who makes his living on system administration.

Use your brain.

LOL- thanks for having the balls to put it as bluntly as I was thinking!
 

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