Four marine biologists plan a deep ocean expedition. Equipped with state-of-the-art submersibles and a mix of skepticism and excitement, the team begins their descent into the intriguing waters. As they travel deeper, the vibrant colors of the shallows gradually fade into an inky darkness, revealing eerie bioluminescent organisms that dance in the deep. Initially, their findings appear to align with expected phenomena—strange fish, deep-ocean coral structures, and colorful jellyfish, all of which fill them with wonder. However, as they continue their exploration, they encounter unexpected occurrences: strange magnetic fluctuations disrupt their equipment, and communications with their surface team begin to fail intermittently. Tensions rise as the group argues over the increasingly bizarre readings, which seem to move outside the realm of scientific explanation.

The deeper they go, the more sinister the ocean reveals itself to be.

Trapped in a race against time as their submarine starts to malfunction amid the rising chaos, the team must find a way to comprehend the ancient landscape and knowledge buried in its depths—or face ending up as just another set of lost souls who were mislaid by The Black Ocean. As they discover the truth about what lies within, they must make a choice: heed the warnings of the ocean, or risk the wrath of its forgotten guardians. In the climax, in a heart-pounding confrontation with a sentient force guarding the water's secrets, each member of the team must confront their past and the choices that led them to this moment.

Will they escape the grasp of The Black Ocean, or will they become part of the dark legacy it holds..?