The abyss, some people love it, some people hate it. Personally I like it, but there is somthing that I don't understand, the air cylinder used for firefighting on board the rig. I assume that it would have been filled with an air mix breathable at whatever depth they were at. When the rig goes deeper, wouldn;t thwere have been a high chance that the mix could have become toxic on account of the higher preseance of oxygen? (remember the balloon conversation in sphere)

(I seem to notice diving mistakes in a lot of TV stuff)
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