Deepest Trench is an action-adventure game from Favor Games that places two players in a local co-op military operation within the Mariana Trench. Success hinges on communication and teamwork as players navigate hazardous underwater terrain, uncover hidden mysteries, and confront unexpected dangers. The game progresses with increasing difficulty and introduces dynamic events to maintain engagement.

The core loop involves cooperative exploration and strategic navigation through progressively challenging environments. Players must piece together clues and records to unravel the secrets of the abyss, with effective communication being paramount to overcoming obstacles and adversaries. Deepest Trench utilizes immersive visuals and atmospheric sound design to create a distinct sense of place.