Episode Title:Life Signs.Episode Description:Deep in a cavern on the planet Mars Captain Taylor and runaway scientist, Professor Karim, are trapped after a cave in. Karim's space suit is damaged and moving the rocks on top of him would make the tear worse. Alan and Virgil fly to the red planet and assist with the aid of a space POD and a modified exo-suit. However, the POD is crushed by another cave in and the only way to save Karim is for Virgil to seal himself in the tunnel and fill it full of air using oxygen tanks. This leaves Alan very little time for him to dig them out with Thunderbird 3's drill.