Seaquest DSV is set in the mid-21st century, as humankind expands its undersea colonization efforts and a tenuous world peace is enforced by the United Earth Oceans (UEO). In order to protect the fledgling underwater colonies from unknown dangers and hostile invaders lurking in the depths of Earth's last frontier, the UEO recruits Captain Nathan Bridger to command the high-tech battle submarine seaQuest and its diverse and eclectic crew.