Jonas Taylor, the amazing rescue diver from The Meg (2018), returns to lead a research team on an exploratory dive into the deepest depths of the ocean. Their voyage spirals into chaos when a malevolent mining operation threatens their mission and forces them into a high-stakes battle for survival. 

Technology has improved since their last encounter with the prehistoric shark, and the researchers are now soldiers outfitted in suits that allow them to walk on the ocean floor and carry rifles. Pitted against colossal, prehistoric sharks and relentless environmental plunderers, they must outrun, outsmart and outswim their merciless predators.