Professor Corvell has stunned the scientific and political worlds with proposals relevant to man's exploration of space. Dr. Palfrey and Z5 must protect him. But Corvall is also an expert on the control of water. He is then swept off of a ship by a huge spout of water that follows the appearance of a small submarine. It is well known that underground nuclear explosions can cause tidal waves if set off in the right place, but what is the cause of this latest string of events? Dr. Palfrey and Z5 have to investigate. Is someone controlling the oceans at least to a limited extent? And how?