minesweeper

A minesweeper is a naval vessel designed to detect and destroy underwater mines, clearing safe passage for other ships.

The work is dangerous and methodical, requiring specialized equipment to trigger or disarm explosives before they can damage larger vessels.

By extension, minesweeper refers to the classic computer game where players uncover squares on a grid while avoiding hidden mines, using numeric clues to deduce their locations: I wasted an hour playing minesweeper instead of working. (Capitalized Minesweeper often refers specifically to the Microsoft Windows game.)