Tom Cruise is allegedly planning to build a $10 million bunker underneath in preparation for the end of the world.The 'Top Gun' star, who is a devout follower of Scientology, is said to believe evil intergalactic ruler Xenu will attack Earth and so has designed a place to hide underneath his Colorado mansion.A source told America's Star magazine: "Tom is planning to build a $10 million bunker under his Telluride estate."It's a self-contained underground shelter with a high tech air-purifying system where up to ten people can survive for years."Scientology's founder, science fiction writer L. Ron Hubbard, claimed extra-terrestrial beings were sent to Earth by intergalactic ruler Xenu, who then destroyed the aliens with hydrogen bombs in a volcano. The aliens' souls attached themselves to chosen humans, known as thetans, who will be one day be saved.Tom is a devout follower of the bizarre sci-fi cult and has been hailed by leaders of the faith as the "chosen one" who will spread the word of the religion.The 45-year-old actor is currently in Berlin filming World War II drama, 'Valkyrie'.

He has been joined by wife Katie Holmes and 17-month-old daughter Suri, but his adopted children with first wife Nicole Kidman - Isabella, 14, and 12-year-old son Connor - are said to have spent the summer at a Scientology camp.

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