Rebreather question

[Inspirationdiver]

The PO2 can climb quickly with the rapid addition of oxygen. This is not the problem that you have to deal with immediately. With the rapid addition of any gas to the loop, you will become positively bouyant very quickly and you must react to control your bouyancy. By reacting quickly to the bouyancy change, you can knock down the climbing PO2 with diluent and prevent exposure to high PO2. A very short time on a high PO2, even as high as 2.0-2.5, will most likely not cause oxygen toxicity issues.