In his previous life, Lu Chuan was worth tens of billions, yet his heart was full of regrets. After waking up one day, he finds himself back in 1999! His father, Lu Dahai, was severely injured in a maritime disaster and is fighting for his life in the hospital. The family owes 5,000 yuan, a local bully comes to collect the debt, and his second older brother nearly commits a terrible mistake! At this critical moment, the Sea God Sonar System suddenly awakens! The pitch-black seabed becomes a treasure trove in his eyes. Wild large yellow croakers, premium butter crabs, and giant hundred-jin deep-sea giant groupers—while others rely on luck when going out to sea, he specializes in hauling in the biggest catches! From a leaky old boat to building the steel giant ship Millennium with his own hands, Lu Chuan is determined this time not only to give his family a better life but also to build his own maritime business empire!