Nautilus's ultimate, Depth Charge, seeks out opponents and pops up everything en route, and finally pops up the target when it reaches him. What happens if the target teleports just as Depth Charge is cast? Does it slowly make its way across the map? Does it have a maximum range? If it has a maximum range, is it possible to evade with the likes of Flash? What is the range?
When Xypherous did his Dev Diary for Nautilus he answered this question:
Link to the source
Found a video of someone actually managing to outrun Nautilus' ultimate: