chunk: Ripley discovers that Burke deliberately sent the colonists to investigate the derelict spaceship where the Nostromo crew first encountered the Alien eggs, believing he could become wealthy by recovering Alien specimens for use as biological weapons. She threatens to expose him, but Bishop informs the group of a greater danger: the power plant was damaged by the dropship crash, and will soon explode with the force of a 40-megaton thermonuclear weapon. He volunteers to crawl through several hundred meters of piping conduits to reach the colony's transmitter and remotely pilot the Sulaco's remaining dropship to the surface.