An earthquake off the coast of South America creates an enormous tidal wave threatening oceanographers in the area, an oil derrick home to several workers, and worse, the entire population of Chile. Wendy Waters, with the assistance of Gil Gripper, must strategically place a detonation device beneath the ocean's surface to help quash the tidal wave before it wipes out all of Chile. Unfortunately, she is ill at ease with underwater rescues because of a scuba-diving incident that happened in her childhood. For the sake of the rescue, Wendy faces her fear by trusting the training of Gil Gripper, the professional expert in this field, so that she can deal with the situation at hand.