Radio astronomers discover a mysterious signal in the deep sea that could be contact with extraterrestrials. After several terrifying manifestations threaten their beliefs, the team must fight to survive the ultimate evil.

当 Jaq 和 Shane 的手机收到儿童被绑架的警报时，一次普通的同车旅行变成了一场高风险的猫鼠游戏...