In the season finale of Beneath, Caleb has a surprising ally in the battle to defeat an ancient power and free Titanic’s trapped spirits. Caleb and Kate struggle to escape the Titanic wreckage before it collapses and sinks into the mud of the ocean floor. As the two escape to the surface in Junior, Caleb makes a devastating discovery and must do the unthinkable to contain the deadly evil.

We jump back to 1912 and the final hours of Titanic. Caleb’s great uncle PATRICK PEELS works with the mysterious MATILDA BANES to smuggle Babylonian artifacts. Patrick becomes more and more obsessed with his findings and Matilda reveals the true nature of the Titanic tragedy. As the ship sinks, Patrick and Matilda work to contain an ancient, deadly power. Meanwhile in the present, Caleb and Kate are separated in the actively haunted wreckage. In the sunken ship’s storage, Caleb comes face to face with an unearthly evil.

We learn the tragic fate of Bell’s first Titanic expedition as Kate has a violent encounter with the Russian sub’s undead pilot. After the explosions that sank Topside, Caleb manages to escape in Junior - a small, one-person sub to rescue Kate. Together, Kate and Caleb begin to unpack the consequences of Simon’s actions and look to find a way to stop him from unleashing a deadly force on the world. But something is following them.

With a nearly empty tank, Kate discovers the wreckage of a Russian sub from Bell’s previous Titanic expedition. Inside she finds more oxygen tanks and the third artifact - a crown. Meanwhile on Topside, Caleb is accused of sabotage and Sue reveals her true allegiances. Caleb learns the truth behind the artifacts and the sinking of Titanic and is forced to make an impossible choice between trusting Sue’s judgment and saving Kate from the ocean’s depths.

With another crew member down and the sub malfunctioning, Sue tries to trigger an automatic ascent and bring the sub back to the surface despite the raging weather conditions. Simon becomes increasingly focused on securing the artifacts and subsequently puts the whole mission at risk in order to obtain them. Kate finds herself in a precarious position in navigating Simon’s volatile state of mind. Meanwhile on the Mosby, someone aboard has caused near irreparable repair to the engine, while Sue investigates, Caleb assists Kate via the radio.

Back on the sub, Kate, Benson, and Simon Bell try and untangle the events that lead to Noel’s death. The hurricane worsens topside and prevents the CETO crew from ascending to the Mosby. Simon insists that they attempt to go back into the Titanic while they are stuck below anyway. Kate’s findings from her traumatic dive lead her to support Simon despite their very different reasons for wanting to return to the Titanic. Against Benson’s wishes, Kate returns to the Titanic to retrieve further samples of the mysterious substance she found with Noel. While on Titanic, Kate discovers the second artifact - a diamond encrusted skull - but is nearly killed in the process. With Caleb’s help, she escapes only to find there has been a violent disaster with Bell and Benson on the sub.

In episode two of Beneath, with Noel in peril, Kate suits up and heads into the wreckage to bring her back to the sub. When the sub communications get scrambled, Caleb guides Kate from Topside. Tensions continue to rise on the sub between Benson and Simon while a storm brews on the ocean surface, forcing Sue to make hasty calls to keep everyone safe both topside on the Mosby and down below on the CETO. Kate discovers Noel alive, but wrapped in a strange cocoon and gripping a dagger-like scepter. The first artifact. On the way back to the sub, Noel regains consciousness and screams that she can see the dead passengers from Titanic all around her. Her haunting visions lead her to take disastrous steps.

In Beneath’s series premiere, the book-smart, reticent DR. CALEB PEELS, a professor of ancient religion, has been recruited by the eccentric billionaire and adventurer SIMON BELL and finds himself on a sea-tossed research vessel bound for the Titanic wreckage. Caleb has been hired to decipher the mysterious writings of his own great uncle, who drowned on Titanic. Bell is convinced the journal will lead them to an incredible discovery - three priceless Babylonian artifacts. On the research vessel Caleb meets the salty first mate SUE TELIT, the gruff submarine pilot G.L. BENSON, the bubble-gum popping young diver NOEL, and the determined and alluring marine biologist DR. KATE WHEELER. As the weather turns dangerous, Simon Bell, Benson, Noel, and Kate load into the state-of-the-art CETO submarine and make the difficult journey to the ocean floor. Caleb remains with Sue monitoring the mission (and an approaching hurricane) from the Mosby Topside. Once there, Noel suits up and heads deep into the Titanic wreckage. As the others listen on the radio, Noel encounters an unspeakable horror.

Fifteen hundred souls went down with the Titanic. That was just the beginning...