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Everything has 2 mushroom valves. The failure of EITHER one will have the same results.does the prism have 2 mushroom valves? for them both to fail to the extend of co2 build up seems very unlikely.
pretty sure he did BO even if he did not mention it !@Marie13,
Could you have switched to bailout at depth and breathed it a short while to see if the weird feeling went away?
rx7diver