Your mining missing was too ambitious. You have pierced the core of the planet. As lava spews forth, you must make a frenzied flight to the surface. Construction obstacles line the walls of your tunnel, so stay alert and move quickly.
Use the score, shield, and speed powerups to make your journey possible. If you go too fast, you may not be able to dodge the obstacles in time; but if you go too slow, the lava will incinerate you.
Watch for your friends that have been stranded in their ships. Guide them to safety with you and then sleep the deep, restful sleep of a hero.