give nukies an option to make the nuke display a timer

[Roomba]

I think walling up the nuke is fine, because thermite exists. If the crew forgets they have a tool that can immediately dissolve walls, that's entirely on them.

I also think telesci is fine, though, because you still have to get the nuke unscrewed, which takes a non-trivial amount of time and requires you jump in yourself. Either the nukies were dumb enough to seal it up to the point even they can't reach it and interfere with the process, or they're getting overrun and would likely have lost anyway.