Qian Ting Zong Dong Yuan: Huan You Diqiu 80 Tian

Douhao is a small submarine whose defects make others doubt that he belongs on a grand ocean expedition. Determined to prove himself, he joins a journey around the globe and meets an unexpected version of himself from the future, bringing warnings of strange seaquakes, missing marine life, and a danger spreading beneath the oceans.

What begins as an eighty-day adventure becomes an investigation into a conspiracy threatening the sea itself. With friends at his side, Douhao races from one underwater region to another, discovering that saving the ocean will require more than speed: he must overcome the insecurity that has followed him since the journey began.