Lloyd Bridges stars as the leader of a perilous deep sea mission. Apocalyptic tidal waves caused by earthquakes threaten to destroy the world's coastal cities, and the fate of the earth is in the hands of six scientists. The intrepid team confronts all the wonders and terrors of the deep: rock formations that are both beautiful and treacherous; a giant moray eel; and a spouting volcano sucking them into its fiery crater.