Endeavor: Deep Sea is a scenario-driven board game where players strive to positively impact the world's oceans. Gameplay involves recruiting specialists, expanding fleets, and publishing journals to gain attributes like reputation and ingenuity. Players score points by increasing these attributes, achieving scenario-specific goals, and placing impact markers on a board. The game offers solo, cooperative, and competitive modes, with various challenges and rewards depending on the chosen scenario and game mode. Winning requires strategic resource management and achieving the highest overall score.