Black Water: Abyss sees adventure-seeking couple Eric (Luke Mitchell) and Jennifer (Jessica McNamee) convincing their friends Yolanda (Amali Golden) and Viktor (Benjamin Hoetjes) to explore an uncharted cave system, in remote North Australia, with the help of the unpredictable Cash (Anthony J. Sharpe) as their guide. When a tropical storm floods the caves, the adventurers are trapped in the dark recesses underground, cut off from the outside world. As the waters rise they soon realise they aren't alone, and their desperate attempt to escape turns into a frantic man and woman versus crocodile fight for survival.