This pilot episode marks the television introduction of Admiral Nelson and the nuclear submarine Seaview. It also introduced Captain Lee Crane. The pilot deals with natural seismic activity located in the North Pole, which threatens to create worldwide tsunamis. These tsunamis are large enough to destroy coastal cities in all outlying areas around the world. The concern is that foreign powers would use the destruction to attempt a takeover of the world. Nelson and a fellow scientist create a plan, which requires setting off a nuclear device. This nuke would counter act the second and deadliest of the tsunamis. Seaview sets out to complete its mission, having eleven days to do so. Within that time, foreign powers attempt all means of stopping Seaview from completing its mission. Suffering d