Incentive Software, 1987
In the far future, the human race has abandoned Earth for the reaches of outer space, having ruined the planet in the relentless quest for resources and in endless conflict. In a desperate search to find a new home, they found Evath, a life-sustaining planet with two moons, Mitral and Tricuspid. Generations passed, and the colony on Evath was formed.
Mitral, having been abandoned in its unstable state, is going to explode within four hours, and the explosion will take Evath with it. Your mission is to use the excavation probe "Last Hope" to place eighteen drilling rigs around Mitral to allow the gas to dissipate harmlessly into space and prevent this disaster. Things are not so simple though, with the security systems activated.