I was reading an article in the DAN Alert Diver Magazine that was to do with a diver (not recreational) who had oxygen toxicity. It mentioned about the rescue operation of getting the diver out the water and back onto the boat, where they gave him oxygen.

Now, i've done the rescue course and know that giving someone oxygen to inhale will help them, and I know that oxygen is toxic at depth.

What I can't get my head around is why would giving someone who has oxygen toxicity oxygen???

Any insight into this would be appreciated as i'm confused