Doctor, you've got to do something to help him.
Before we act, we must think. Now, the Macra that have come to the surface of this planet have not found sufficient gas in the atmosphere, so they've had to get somebody to pump it up from down below.
But, if it's life and death to them, why do they waste it? Why divert it into the old shaft?
[thinking aloud] That's obvious, Polly, obvious. Because there's something trapped down there they wish to keep alive!
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