During a routine submarine dive, oceanographer Laura Daughtery discovers an unknown life form and unearths a government cover-up operation led by scientist Dr. Aleksander Cirko. Meanwhile, Louisiana fisherman Richard Beck loses his brother in a suspicious diving accident, and a young boy named Miles sneaks an unusual aquatic egg into his home. From the South Antarctic Sea and the Gulf of Mexico to San Diego and Monterey, there's something lurking beneath the Surface.
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Episode 15 01x15
As a tsunami approaches, the Wilmington, N.C., area is evacuated, and Miles and his family join the exodus. Meanwhile, Laura searches for Rich, who has been arrested and is being held in an underground facility.
Episode 14 01x14
Hoping to learn more about the creatures and the experiments behind them, Rich and Laura hunt down the mysterious Davis Lee for answers. But encountering Lee brings out a dark and violent side to Rich. Meanwhile, Miles---now a pariah at school because of his bizarre behavior---retaliates when he's attacked by a smug bully.
Episode 13 01x13
Rich comes to Laura's rescue when she is drugged and left in a field after discovering the truth about the deadly species' origin. The pair then go on a mission to track down the scientists behind the creatures' creation. Elsewhere, Miles joins a group of aquarium workers on a boat trip to find the unhatched eggs.
Episode 12 01x12
Lee and his agents pursue Laura and Rich. While in hiding, Laura communicates with a mysterious stranger who may know something about the creatures. Elsewhere, Miles and Caitlin go to a late-night beach party that turns tragic.
Episode 11 01x11
Rich and Laura escape from the hospital with footage of the creatures and plan to show it to a news station. Meanwhile, Miles has all but given up hope that Nimrod is alive.
Episode 10 01x10
After resurfacing from their trip to the ocean floor, Laura and Rich discover that their boat has disappeared. Meanwhile, Miles becomes ill in class and Savannah thinks that Nimrod may have something to do with it.
Episode 9 01x09
As Laura and Rich struggle in their submersible, they're horrified to discover that the mysterious species is laying thousands of eggs underwater. Meanwhile, Miles suspects Nimrod is to blame for a vicious attack on the docks.
Episode 8 01x08
Laura, Rich and Jackson try to use the submersible device they built to investigate the spawning site. But when Rich and Laura begin to descend, they experience technical difficulties that endanger their lives. Elsewhere, Miles does volunteer work at an aquarium.
Episode 7 01x07
A cover-up imperils Laura, hiding out with Rich in a California cove, where she makes disturbing finds on the creatures from Cirko's files. Elsewhere, a frantic Miles flees with Nim in a getaway that embattles him with cops and forces him to make an emotional decision.
Episode 6 01x06
Cover-up rogues imperil Laura and Rich, who are dogged by assassins while seeking evidence of the predatory sea creatures. Also: Niles goes to great lengths to protect Nim, whose discovery has serious ramifications with Niles' parents.