Quarra was an industrious and technologically-advanced planet, with systems that require high levels of supervision and involve little automation, making it unique for a planet with a warp-capable society. This in turn caused the planet to require large amount of manpower. In 2377, this demand caused Quarra to suffer from a manpower shortage.
To cope with this, their military sent out radioactive mines that would explode on a ship's hull and infect the crew. The crew would then have to abandon ship, and the Quarrens would take them back to their homeworld and commandeer the ship.