Hidden Deep is a tense 2D action-exploration thriller that drops you and your team into a mining and research facility buried more than a mile beneath the ocean floor. The premise is simple and effective: a research team investigating strange anomalies goes silent after 681 days, and you lead the rescue expedition to uncover what happened and pull out any survivors. The game leans heavily into atmospheric, claustrophobic sci‑fi horror inspired by 80s-90s classics.