Within a sprawling underwater metropolis built by a lost civilization, a marine biologist named Ava stumbles upon an ancient artifact - a device that can control the ocean currents. This artifact, she discovers, was used by the civilization to maintain a delicate ecological balance before a devastating event plunged their city into darkness. Now, with the ecosystem on the brink of collapse, Ava must use the device to restore the balance and uncover the secrets of the lost civilization before it's too late.