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A monstrous disaster - an earthquake of unprecedented strength - finds hundreds of unfortunate people in the carriages of the N7 train of the Los Angeles subway. Powerful shocks throw up the train, and the accelerating train crushes and breaks through stone walls at full speed. The miraculously saved passengers do not suspect that real hell is yet to come. A merciless element has destroyed the water supply channels, and a squall of water rushes into the tunnel towards the mutilated train.