The Fisherman's Apocalypse Ark

When apocalyptic rainstorms descend and seawater floods the entire globe, fisherman Hayden Holt is abandoned by his wife and daughter. He accidentally activates the Warship Evolution System, and his ancestral broken fishing boat can continuously evolve and upgrade. He takes in survivors along the way, builds a base at North Haven, fends off pirates, hunts sea monsters, forms a fleet, and finally establishes the New Maritime Order, rising from a cowardly loser mocked by everyone to the guardian of the apocalyptic ocean.