n the early 21st century, mankind has colonized the oceans. The United Earth Oceans Organization enlists Captain Nathan Bridger and the submarine seaQuest DSV to keep the peace and explore the last frontier on Earth.
When a preserved annexe of the Great Library of Alexandria is discovered, many nations send their fleets to lay claim to its treasures. The UEO orders Bridger to mediate the dispute and sends a team of ESP parapsychologists to help the negotiations.
The crew of seaQuest rescue a warden and his only prisoner from beneath the ice cap. The prisoner escapes and reveals that he holds a deadly toxin which will be released unless the crew does as he says, which is launching the seaQuest's missiles against the UEO.
The seaQuest discovers a group of children living in an old munitions facility on the sea floor and they must evacuate them, before, the structure collapses and unleashes a deadly explosion. Meanwhile, Lucas develops a crush on the teenage girl.
When Commander Ford and other crew members are contaminated with a deadly virus from a downed space station, Captain Bridger finds himself fighting against the clock and a government cover-up to save them.
A hurricane threatens to prevent the rescue of a French sightseeing submarine which is stuck in a freshwater sink hole and running out of oxygen. When a team from the seaQuest are forced to the surface they must rely on each other to survive the storm.
When a vital component of seaQuest's air conditioning fails and regular channels fail, Krieg relies on a black market source called The Regulator. When Darwin disappears the seaQuest must track down the renegade who is seeking the meaning of life.
Hitchcock goes into an underwater gold mining colony in order to investigate a distress signal and discovers that the original and rightful owner of the mine and his family are being held hostage by an outlaw and his thugs.
When Lucas visits a communications base populated by a group of young computer experts, a famous computer hacker, who now runs the Node, persuades Lucas to break into the World Bank and divert funds for humanitarian causes.
seaQuest is hurriedly dispatched to rescue a crew returning from a manned mission to Mars when their space capsule crash lands in the Atlantic Ocean, but the president of an militarised Asian federation wants them too for his own reasons.
When a top-secret UEO project shows the approach of a catastrophic volcanic eruption, the crew of seaQuest must convince treasure seekers on the island to abandon their lifelong search or face certain death.
A renegade sub is sinking whaling ships, which are in themselves illegal and against their moral judgement, the crew of seaQuest must stop the sub from its mission. Meanwhile, Krieg is on a mission of his own: to have a cheeseburger, despite red meat being outlawed.
A brand new power plant which is set to supply energy to the whole world goes wrong and there is a danger of the polar ice caps melting. Bridger decides he must sacrifice the seaQuest in order to save the world. Meanwhile, Lucas has a reunion of sorts with his father.