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At the beginning of "The Doctor Falls" (s10, e14), the Doctor

saves the city at the bottom level by changing the cybermen's definition of human to two hearts, thus redirecting them on him and the two Masters.

Later in the episode, two things happen of import to the question, and one in the previous episode. One of the former is that

the patients emerge at night in the solar farm, presumably to collect children.

This means they probably used the elevators, or have been traveling a while. Either way, they are able to identify humans. The other of the former of import is that

the cybermen have to have a lift called in order to identify the level the Time Lords are on.

But in the previous episode

they are capable of identifying humans all the way on the first level.

Therefore, if they

identify humans by two hearts, and they had long range sensors, why couldn't they pinpoint the only three 'humans' on board immediately? Or, for that matter, just follow the trail of broken ceilings their ship crashed through?

Why Couldn't the Cybermen Find the Doctor?

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    You wrote "changing the cybermen's definition of human to two hearts" I think he changed the definition to include those with 2 hearts not target only them. (if that's what you meant, I just misunderstood) – elrond Jul 11 '17 at 11:58
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    Did they need the lift to be called? I thought the problem was simply that calling the lift brought up a Cyberman. – Bellerophon Jul 11 '17 at 12:00
  • @elrond The Doctor was not attempting to save himself, he was trying to save the city. As such, simply adding the two hearts wouldn't warrant the response he got. When you see shots of humans being collected, it is about 1:2 patient to human ratio. The Time Lords got a response blown way out of proportion, indicating they were the only target. – Imperator Jul 11 '17 at 12:01
  • @bellerophon The Master followed that action up with a statement along the lines of ' Great, now they know where we are'. – Imperator Jul 11 '17 at 12:03
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    @elrond: I think the <= comparison must be right, since they recognized Bill as human even when she had less than one heart. Following from that, we can imply a huge off-screen jump in artificial heart production to repair all of the suddenly "damaged" patients. – Simon Jul 11 '17 at 21:01

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