There are two stations orbiting a rotating black hole. One is far enough out to experience no time d...

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There are two stations orbiting a rotating black hole. One is far enough out to experience no time dilation, and one is at the innermost stable circular orbit. If a ship were to leave the outer station to travel to the inner station, how would an observer on the outer station perceive the ship?

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Would the ship disappear after being redshifted as the light gets more and more distorted by extreme gravity?

Would the ship appear to be slowing down as it got further away?

Let's say that the trip to the inner station takes 1 week, and for the observer at the outer station, it takes 5 years.

How would you tell when the ship is coming back if all of the information (light) is distorted by the black hole's gravity?

How long might it take for communications between the two stations to travel?

This hypothetical is for a book I am writing so thanks in advance for the help!

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