According to our current understanding of general relativity, once an object crosses the event horizon of a black hole, it is generally believed that it will inevitably move towards the singularity at the center. The singularity is a point of infinite density where the laws of physics, as we currently understand them, break down.
Inside the event horizon, the gravitational pull of the black hole becomes extremely strong, and the escape velocity exceeds the speed of light. This means that even light cannot escape from within the event horizon, let alone objects with mass. Since the orbital velocity required to maintain a stable orbit is always lower than the escape velocity, it would not be possible to achieve a stable orbit inside the event horizon.
It's worth noting that our current understanding of physics, particularly in the context of black holes, is limited. The study of black holes and the physics near the singularity is an area of active research, and there are ongoing efforts to develop a more comprehensive theory that can better describe the behavior of matter and space-time in extreme gravitational environments. However, based on our current knowledge, stable orbits within the event horizon are not considered possible.