Black hole incident

Mrs. Fisher, Mr. Ruston and Mr. Murdoch were conducting an experiment. They were trying to create their own Black hole in order to use it as an instrument of time travel. Something went wrong and they are stuck in limbo. They are not able to return to the present, but neither are they able to visit the past. Try and break the loop and get them out. They have promised free A++ for life to the first person to get them out. Good Luck