K_girl
Contributor
A question - if CO2 buildup starts to happen in a situation where you need to exert yourself i.e. strong current how do you prevent or curtail it. Once you pass a certain point I find it very hard to recover short of just going with the current which is not always a good idea.
Trying to swim against a strong current could be worse, much worse, but here are some ideas if you find yourself in this situation:
1. Heavy current is typically the case from the start of the dive and most problems will occur early in the dive. If you are in a situation where no one is tending a boat, abort the dive immediately in strong current. If you are in a situation where someone is tending the boat and you've been deep, I would say, anything 10 minutes or less, do a slow ascent and skip the safety stop. Or, look at your nitrogen loading if you have done multiple dives in the same day. If you've done a proper surface interval, under 10 minutes, you are probably still OK to skip the safety stop.
2. During the ascent, or if you need to do a safety stop, maintain your position by fixing on a point on the bottom. Do not try to make progress against a strong current. You can preserve your breathing and your air usage by just maintaining a position. Force yourself to breathe deep and breathe slowly, your body will get more oxygen that way. Don't try to make it back to the boat, plan to let the boat pick you up. In a strong current, you are not the only one who will not make it back to the boat. Carry a safety sausage and a whistle, you will have less to worry about.
3. If you cannot see the bottom during the ascent and safety stop (if needed), point yourself into the current and kick in a slow, steady manner as to not overexert yourself. You can get some reassurance that you are maintaining position by watching the particles go by you.
In my sister's situation last year, by going up with her, I helped her to maintain a slow ascent. When we reached the safety stop level she attempted to swim back down to do a safety stop. We were in heavy current, I looked at my computer and saw that only 8 minutes had passed. It was the first dive of the trip, so we had little nitrogen loading and the computer showed little nitrogen loading. I gave her the signal to ascend because of the current and I knew they only had one little skiff and they were going to have to pick-up a lot of people and I thought it best that we be one of the first - and we were. When we were on the surface she said she thought that I was disappointed that she had to abort. I told her - no - I was concerned about the current and reassured her that anytime she needs to abort a dive, I have no problem with that and I will always stick with her. I told her it is better to abort early than later. I told her all the things she did right which was - she signaled me to go up, she stayed with me and didn't make a bee-line to the surface, she didn't grab for my reg in a panic, she attempted to do a safety stop, she stopped herself from breathing in water. Actually, I didn't know she was so panicked until she told me at the surface. So all-in-all, even though it was a harrowing experience for her, she learned a lot about herself and has become a better diver for it.