Called in by his superior, Montigue Yarbro, he is offered a lifetime opportunity - to complete his training and gain a promotion to Elite within the Driller Federation in one fell swoop. His experience on Mitral bore him well - he was to go to Mitral and attempt to avert the coming catastrophe. Mitral, having been abandoned in its unstable state by the Ketars, was going to explode within four hours, and the explosion would take Evath with it. Skerrit's mission was 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 prior to the Ketars' departure.