The short answer is, no one knows!
Black holes have so much gravity that nothing, not even light, can escape. This means that once you fall into a black hole, even if you were travelling in a rocket that could travel at the speed of light, you would not be able to escape and tell us what you saw!
Even if we send in a drone that could send signals (like radio) back to us, the signals could never escape the black hole because they also travel at the speed of light.
So unfortunately it is one of the Universe’s great mysteries – we’ll never know what is inside a black hole.
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