A deep-sea earthquake occurs, creating a tidal wave that is headed straight for Haeundae, a popular vacation spot on the south coast of Korea, which draws visitors from all over the world. During its peak season, more than a million vacationers pack onto its narrow one-mile strip of sand. While tracking offshore seismic activity, Professor Kim, a marine geologist, recognizes the impending danger of a mega tsunami. He desperately attempts to warn authorities and alert the unknowing vacationers of the 500 MPH destructive force of nature headed their direction.