As of 2026, the post-apocalyptic world of Once Human continues to captivate players with its unique blend of cosmic horror and survival mechanics. Scattered across its desolate open world are the Securement Silos, instanced dungeons that offer challenging puzzles, formidable bosses, and valuable rewards. These facilities, accessible in Normal, Hard, and Pro difficulties, are key to progression and resource farming. This guide delves into the distinct challenges and strategies for each known silo, helping survivors navigate these perilous depths.
Securement Silo ALPHA: A Sniper's Gauntlet
This facility is a stronghold for the Rosetta faction, presenting a significant challenge primarily due to the overwhelming ranged damage players must endure. The silo's architecture features multi-level platforms and high walkways, which are often occupied by pesky sniper units and grenadiers. Navigating this environment requires constant awareness and effective use of cover.
A small puzzle in the bonus section involves energizing power conduits to release a mini-boss. The final boss encounter is more manageable if players maintain their distance. The optimal strategy is to clear all standard enemies while kiting the boss around the arena. Once the room is clear, focus all firepower on the boss. This tactic remains effective even in Hard mode. However, farming this silo can be a slow process due to the abundance of ranged foes. Another drawback is the absence of polluted enemies, meaning no Acid resources are dropped here.
Securement Silo PSI: The Frigid Menace
Another Rosetta-controlled site, PSI similarly forces players to dodge snipers and grenadiers. Caution is advised on a first run, as enemies often lurk around corners. The boss fight here is notably irritating. Players face a deviant refrigerator perched atop a trash pile in a large, frozen chamber.
The room is littered with frozen Rosetta statues that thaw and become active as the battle progresses. To defeat the boss, players must dismantle two shields protecting generators. This is done by picking up ice spikes hurled by the boss and using them to shatter the shields. Only after destroying the generators can the boss be finished off.
Securement Silo PHI: Acid Harvest Grounds
This marks the first polluted silo on the list, meaning it's inhabited by deviated enemies. This is excellent news for resource gatherers, as these foes frequently drop Acid; a full run can yield approximately 30 units.
Several rooms are densely packed with adversaries, posing a significant threat to under-leveled or under-geared players. The best approach is to kite enemies, turning periodically to unleash a full magazine before continuing to evade. The boss fight is complicated by the continuous spawning of standard enemies from destructible spawners. The boss itself is not overly dangerous if engaged from a distance.
Securement Silo SIGMA: The Arcade Defense
A Rosetta installation populated by numerous ranged enemies (though fewer snipers), SIGMA is manageable if players advance cautiously through large rooms, using cover for reloading. A peculiar seepage zone event transports players to a children's playroom where they must defend an arcade machine from waves of polluted enemies. This segment is entirely optional.
The boss fight is straightforward initially: eliminate the adds that spawn with the boss, then focus on it. However, after losing about one-third of its health, the boss becomes immune to standard gunfire. Players must then locate and use a minigun found on the floor of the boss arena to secure the kill.
Securement Silo THETA: Prime Acid Farming Location
Considered one of the better silos, THETA is filled with polluted enemies, making it an ideal spot for Acid farming. The opening can be chaotic if spawns are triggered unprepared; grenades and explosives are useful for preemptively striking spawn points.
The seepage zone features an engaging puzzle: a room with six statues and water puddles showing their shadowy reflections. Rotating each statue to align with its reflection summons a mini-boss. The final boss fight is simple: keep moving to avoid the spawning adds (which despawn upon the boss's death), while dodging its slow ranged attacks and returning fire.
Securement Silo EX1: The Ultimate Challenge
This silo is a thrilling blend of challenges, inhabited by both polluted Rosetta and general deviated enemies, offering decent Acid farming potential. Near the entrance are two large, two-tiered prison cell blocks. These cells open sequentially, releasing increasing numbers of enemies, so maintaining distance is crucial to avoid being surrounded.
A unique puzzle precedes the boss room: a strange road with traffic lights. The rule is simple yet strict: move towards the door only when the light is green; stand completely still when it turns red. Any movement during a red light resets the player to the street's start.
The boss fight is a protracted engagement. Players must shoot out the lights on the boss's head, each destruction chunking its health. Simultaneously, prison cells lining the room continually release standard enemies. If the boss lands a clear shot, it freezes the player, inflicting heavy damage over time. The safest strategy is to attack the boss from behind the pillars scattered around the room, using them for cover against both the boss and the adds.
In summary, each Securement Silo in Once Human presents a unique set of trials, enemy compositions, and rewards. Whether you're seeking a brutal combat test, a puzzling diversion, or efficient resource farming, understanding these distinct dungeons is key to surviving and thriving in the game's twisted landscape. Prepare your gear, strategize your approach, and venture into these depths to uncover their secrets and claim their treasures.
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