Abyssal Signal: Deep Dive

Descend into the dark. Command the depths. Abyssal Signal is a single-player, card-driven submarine combat game set in the crushing dark of a hostile ocean. You are the commander of a deep-sea vessel on a mission to chart unmapped abyssal zones, confront leviathan-class creatures, and recover the relics of a lost expedition. BUILD YOUR COMMAND DECK Master a deck of 64 command cards across four categories. Every turn is a tactical choice: push weapon output for a killing blow, vent heat before your reactor overloads, reinforce your shield, or dive deeper to evade a charging predator. Your loadout of 16 cards defines your entire strategy. SURVIVE THE DEPTH ZONES Five ocean sectors and 60 hand-crafted missions stand between you and the final signal. Each sector introduces new threats: 28 distinct enemy types, 6 bosses with unique combat protocols, and 32 strange anomalies with lasting consequences. Sonar exposure, water currents, destructible enemy parts, and stealth targets keep every dive unpredictable. PROGRESS YOUR FLEET Choose from 3 submarine hulls with distinct attributes. Install and upgrade 36 modules across four equipment slots. Spend Credits and Research Data — earned only through play — on a four-branch research tree that permanently improves your combat performance. Unlock 40 achievements and decrypt 45 archive records that reveal the story of what happened down there. RELICS OF THE ABYSS Clear a mission for the first time to recover one of 24 relics. Equip up to three, stack duplicates for stronger effects, and reveal legendary finds through the Relic Decoder. MODES FOR EVERY COMMANDER • Campaign: 60 missions across 5 ocean sectors • Daily Signal: a fresh challenge every day with unique modifiers • Weekly Contracts: long-form objectives with rotating rules • Endless Descent: how deep can you go before the hull gives out? DESIGNED FOR DEEP FOCUS • Fully offline: no account, no ads, no in-app purchases, no tracking • Deterministic combat engine — every dive is fair, every loss is on you • Immersive procedural deep-sea ambience, sonar pings, and impact audio • Auto-save with resume: an interrupted dive is never a lost dive • Full VoiceOver support across battle, research, hangar, and archives The abyss is listening. Answer the signal.