Grand Subs

Build cave expedition routes where every turn changes your survival chances. The simulation recalculates oxygen consumption, fatigue, and risk zones in real time based on movement decisions. Narrow tunnels, vertical climbs, and unexpected cave events force constant route adaptation. Each expedition evolves differently because cave structures and hazards shift dynamically. Failed runs become valuable replays where new strategies can be tested on the same terrain. Interactive oxygen analysis helps identify critical mistakes before they become fatal. The system rewards efficient planning rather than fast reactions. Every successful return depends on balancing exploration depth against safe extraction.