Planet Crack is a term used to describe when a planet is literally cracked open to be mined for valuable resources. It is known that a large chunk is broken off with powerful gravity tethers, and then brought inside a "Planet Cracker Class" ship where it is then stripped and its ore content is studied. The USG Ishimura, owned by the Concordance Extraction Corporation, is the oldest and consistently largest of the planet crackers. Mining Vessels use gravity tethers to pull massive sections of the planet up to be processed from within the vessel's mining deck. Over the history of CEC's planet cracking endeavors, only one operation of three dozen has met with less than optimal results. Eleven years prior to the events of Dead Space, a mining operation of Wanat, presumably a mining colony, wherein a planet cracker, three supply ships, and a colony were lost due to gravity tether failure. Since that time, CEC has worked closely with the manufacturers and held crew training lectures to ensure a disaster of this magnitude never happens again. The decommissioning and eventual destruction of the Ishimura resulted in planet cracking to lose its credibility; as a result, unemployment in the CEC grew in drastic numbers. It is implied that Planet Cracking operations are very destructive, as this would result and significant disruptions in the planet's gravity and geology, possible rendering it uninhabitable.