Most BCs have other dumps besides the valve. Different body orientation and use of the dumps on the bottom of your BC will really get all the air out!
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I now realise that my weghting probably was correct, but the low air situation will be avoided from now on
From now on i think i will lead myself and go the same way as the DM lol - will start to ascend at 600-800 psi (shallow dives)regardless of the DM (obviously let him know) -- actually saying that of course rule of 3rds for wrecks
My DM was actually very good, especially on my wreck penetrations, as he was always checking on my air situation
You're doing penetrations that require the use of the 3rds rule with less than 24 dives and yet you haven't got your weighting fully under control?
I find this post surprising to say the least.
a little bit of background info: havent dived in 2 years, but took my refresher course, and am now doing my wreck and digital photography spec.
ok so i was doing my 3rd dive this holiday, and i used up my air VERY quickly, (probably from chasing fish in circles to do my digital photography spec), but at 800psi i let my DM know of my air situation. he said ok and continued going along.
anyways a little time passed and i noticed that i was becoming positivly boyant and had to dump all the air from my BCD to stay neutral, so i checked on my air and it was down to 300psi :11:.
now i should mention the dive was at a max depth of 60ft, but mostly at around 40ft. this was following a 110ft dive with 1hr SI.
i started to get a little paniky so i caught up with my DM and told him i need to assend ASAP, he said ok, so i started to assend with the group. As i got to around 30ft i noticed that i became positivly boyant again, as my tank was getting very low, i was unable to keep myself from surfacing, (my dive computer didnt complain about my assent rate), but this meant i missed my saftey stop.
now sorry about the length of this post, but i have some questions:
1. when ur tank is very low how do u stop urself getting positivly boyant? i had already dumped my air from my BCD. if this was from a deeper level im sure i would have suffered from DCI, and even possibly overexpansion problems
2. i know a safety stop is not necessary if im not within 3 groups of my NDL ( i think thats right) but i did deep dive about an hour before, so i probably should have done the saftey stop! obviously i didnt feel any of the symptoms of DCI, but how long should i leave it before diving again? is 24 hours generally ok?
thanks a ton!