A Category 17 typhoon sweeps across the South China Sea, and the black tide reef group is fraught with murderous intent. Search and rescue captain Lu Cang receives orders in times of danger, teaming up with cultural relics expert Shen Chuyan to strike. The World War II sunken warship Black Whale appears shockingly in the abyss, along with the Epang Palace tiger head. The nation's supreme treasure is in imminent danger. The Ghost Ray smuggling group lays an inescapable net. Amidst violent winds and giant waves, a life-and-death duel of deep-sea treasure hunting suddenly breaks out. Beneath the abyss, blades face each other; the nation's heavy vessels shall be guarded to the death.