Finn, a free-diving champion paralyzed by a past tragedy, has sworn off the deep. But when the brilliant and determined marine biologist, Dr. Lena Sharma, arrives with a request that forces him to confront his ghosts, he finds himself pulled back into the currents. She needs his knowledge to study the treacherous Abyss reef; he needs to find a way to breathe again. But the ocean holds its own secrets.