Question: Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: How is the Earth being destroyed? Movie plot title: Escape from the Planet of the Apes Movie plot: The preceding film, 'Beneath the Planet of the Apes', ends with a nuclear weapon's destruction of the apes' future Earth itself and everything on it.'Escape from the Planet of the Apes' begins by establishing that three chimpanzee apes, Cornelius (Roddy McDowall), Zira (Kim Hunter), and Dr. Milo (Sal Mineo) escaped the Earth's destruction by salvaging and repairing the astronaut Taylor's spaceship (which sank in the Dead Lake in the desert Forbidden Zone in the first movie) and piloting it through the nuclear shock wave of Earth's destruction, sending the ship into space and through a time warp wormhole back to present day 1973. The salvage, repair and launch of Taylor's spaceship apparently all happened (off-camera) within the brief period during the final act of the previous film.The three apes arrive on Earth, splashing down on the Pacific coast near Los Angeles. They are found by the surprised local authorities and are transported to a secluded area of the Los Angeles Zoo, under the observation of two scientists, Stephanie Branton (Natalie Trundy) and Lewis Dixon (Bradford Dillman), who administer a series of intelligence tests, which Zira performs unerringly, but she finally loses her patience at the end of the last one and answers Stephanie's question to Lewis with an angry retort. Stephanie and Lewis step outside, completely astonished. Milo argues with Zira and Cornelius about their agreement to hide their ability to speak until they felt the time was right. The argument agitates a wild gorilla on the opposite side of a set of bars in the cages. Milo steps too close to these bars and the wild gorilla reaches through them and strangles Milo to death.Meanwhile, a Presidential Commission has been formed to investigate the return of Taylor's spaceship which was launched the previous year and how the apes, which they already are aware are atypically intelligent, came to be aboard it. Cornelius and Zira are brought before the Presidential Commission, where they publicly reveal their ability to speak, and...
Answer:
Nuclear weapon