It's located in a flooded strip mine, so that ship has sailed. Also from what I gathered it wasn't in operating condition before it was put there so there is a small chance it has its fluids drained beforehand.
It's a filament runout sensor. It's a limit switch that will pause the print if it detects there isn't enough filament to continue so that you can feed in a new spool without having to watch it the whole time.
Voron