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In the 2014 movie "Interstellar" the main character Cooper gets trapped in a black hole and relays data about it to his daughter Murph. What I don't get is if nothing, including light, can escape a black hole, then how is he found by Rangers out of a black hole? My understanding is that black holes are essentially huge gravitational nets in space that nothing can escape. If light can't escape, how does a human escape something like this?

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