Risk of DCS?

[ChilliMouse]

Hi there. I’m new to the boards. We’ve just got back from a holiday where my buddy and I dived a few times together. One dive per day on four consecutive days. On most dives we were in the 10 to 17 metre range. On the last dive we went to 22 metres and gradually ascended with a bit of saw toothing as my buddy was struggling to maintain neutral buoyancy. My concern is we only did half of the safety stop because my buddy couldn’t hold at 5 metres. We did about 90 seconds. I was on nitrox and my buddy on air. Do you think there’s a risk of DCS for either of us? I’ve attached an image of the dive profile. We flew back 48 hours after the dive. Thank you for your help.

 

[lowwall]

You can stop worrying. There is almost zero chance of DCS with that profile even with no safety stop at all.

 

[Sascha314]

Safety stop is something introduced into a model. Its not really mandatory, but advised if close to no decompression limit. If you take a technicalndive computer with gewdient factors your computer will not tell you about a safety stop. Either you have to decompress or you can go straight to surface.
A safety stop would be benefitial for bubble detection, but not for DCS signs.

According to the SSI table I just habe at hand the NDL at 21m is 40min. As only 1 dive per day there is almost no residual nitrogen to consider. The ndl assumes then about 10m/min ascend.
Your dive has been far of this limit, and some stop / slow ascend at shallower depth.
So I would not worry about it, especially you did not encounter symptoms.

 

[ChilliMouse]

You can stop worrying. There is almost zero chance of DCS with that profile even with no safety stop at all.

Thank you. That’s very reassuring. My buddy has a sore jaw (just below her ears) but I think that may be due to biting the regulator quite hard and equalizing a bit too hard! Thank you for responding.

 

[ChilliMouse]

Safety stop is something introduced into a model. Its not really mandatory, but advised if close to no decompression limit. If you take a technicalndive computer with gewdient factors your computer will not tell you about a safety stop. Either you have to decompress or you can go straight to surface.
A safety stop would be benefitial for bubble detection, but not for DCS signs.

According to the SSI table I just habe at hand the NDL at 21m is 40min. As only 1 dive per day there is almost no residual nitrogen to consider. The ndl assumes then about 10m/min ascend.
Your dive has been far of this limit, and some stop / slow ascend at shallower depth.
So I would not worry about it, especially you did not encounter symptoms.

Thank you very much for responding. That’s very reassuring!

 

[Sascha314]

Thank you very much for responding. That’s very reassuring!

You are welcome.


Just put it into Multideco with conservative 40-70 GF.
Direct descent to 21m, stop until 20min dive time and ascend. Thats a more aggressive profile than yours.
It suggests stop for 20 seconds at 6m anf 1min at 3m. That is even fulfilled by your profile. But remember its statistical and depends on your body and daily circumstances. On one da you may be ok with a very aggressive profile, the next day you have mild symptoms on an easy one.
So really no worries here.

Jaw symptom: most likely regulator...

 

[ChilliMouse]

Thank you to everyone who responded. You’ve put my mind at rest. Not doing the full safety stop and the saw tooth ascent gave me the heebie jeebies so I’m very glad to hear I don’t need to worry. Thank you.

 

[rongoodman]

A typical Caribbean liveaboard trip might see you doing 27 dives with similar profiles over the course of 5 1/2 days, yet cases of DCS are pretty rare.

 

[ChilliMouse]

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A typical Caribbean liveaboard might see you doing 27 dives with similar profiles over the course of 5 1/2 days, yet cases of DCS are pretty rare.

Thank you

 

[Nemrod]

My concern is we only did half of the safety stop because my buddy couldn’t hold at 5 metres. We did about 90 seconds. I was on nitrox and my buddy on air. Do you think there’s a risk of DCS for either of us? View attachment 894702View attachment 894702

No.

And you and your friend would by now be showing some symptoms. Quit worrying.

Safety stops are not mandatory, just good practice.