[spoiler]Hardest one: Reset the reactor. You would have to send someone INSIDE it, carrying enough exotic matter to rip the fabric of reality into shreds. Ion thrusters activate, station hovers. Alternatively, eject the core. This one risks sacrificing a ship, and shuts off the engines. Getting everyone off would be recommended first. (You would still have to deal with both the now supercrit reactor and the crashing station.) Finally, and my favorite: push the thing back upward. Going to need to push all the ships on the bottom of this. Big risk, and there might be problems down the road. Very soon down the road. Feel free to mix and match these options to the degree that pleases you.[/spoiler]