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Image I
Could the object move back and forth even in the black hole?
The animation in this text (Image II) shows, how the material behaves in the black hole. But in some theoretical ideas introduced the possibility that the spacecraft can fly past the center of the singularity. And if that thing is possible the object can go back and forth inside the singularity. But as you know that this thing is the only hypothesis, and it bases that in every other ball-shaped structure the object is moving back and forth. So why they don't do that in the singularity?
The black hole is the most powerful object in the universe. And that thing makes it interesting. The thing that happens behind the event horizon, the point where escaping velocity reaches the speed of the light is a mystery because we cannot get any observations behind that point. But as we know, the natural laws are staying also behind the event horizon including time dilation. When escaping velocity reaches the speed of the light the time stops.
The speed of the light is the culmination point for the time. Because time dilation is directly proportional to the escaping velocity, time travels backward behind the event horizon. So when the escaping velocity turns higher than the speed of the light the time will start to travel backward. And if the gravity field is affecting behind the event horizon as it affects in the other ball-shaped structures that thing would make it possible that the object will behave in the event horizon as it behaves in the moon.
If we will dig the tunnel through the moon, and drop the item in it, that thing will start to drop through the tunnel. Then the object will start to drop back into that tunnel. So the object moves back and forth in the tunnel, which has dug through the planet. And that means the particle should move also back and forth inside the event horizon. We have no benefit for that project.
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Image II
And that is the reason why we haven't dig a tunnel through the moon. So that tunnel doesn't decrease the needed mass of the fuel. But the interesting thing is that if the jet of the rocket will point in the event horizon, that thing would pull the particles in it with the speed of the escaping velocity. Particles also drop to the center of the gravity field and if we would try to use this thing for spaceflight. The gravity field on another side of the tunnel will neutralize the effect of the gravity acceleration.
But the thing that makes that effect interesting is that theoretically possible to shoot a rocket through the black hole. That means that the rocket will shoot in singularity, and the speed of it would increase at a very high level because the jet of the rocket will accelerate inside the event horizon. The silly idea is that when the rocket will drop in the black hole, it would just drop through the singularity or the area behind the event horizon.
Then the rocket jet will aim to the center of the singularity, and then the rocket should come out from another side of the event horizon. The thing that makes this kind of hypothesis interesting is that time is moving backward in the black hole. And that thing makes it possible to travel in time. But the thing, that makes this kind of attempt to travel in time very dangerous is that the black holes are very far away from earth. The closest known black hole is 3500 lightyears away from the Earth, and the size of that black hole is not very big. Otherwise, the rocket can scratch in pieces or burn in the transition disk before it even reaches the event horizon.
Image I: https://www.nasa.gov/feature/goddard/2017/swift-maps-a-stars-death-spiral-into-a-black-hole/
Image II: https://www.forbes.com/sites/startswithabang/2020/05/11/how-close-to-earth-is-the-closest-black-hole/?sh=4cb42824e9f9
https://curiosityanddarkmatter.home.blog/2020/12/28/could-the-object-move-back-and-forth-even-in-the-black-hole/
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