Casualties Unknown Layers Guide: Exploring All 11 Alien Planet Cavern Depths

In Casualties: Unknown, players must safely descend through 11 layers of an alien planet while managing survival systems and environmental hazards. The campaign features 10 main layers followed by an 11th shorter layer that concludes the journey. Explorers must navigate harsh alien ecosystems while monitoring physical trauma, hunger, and thirst during each descent.

Progression through the cavern system is gated by survival mastery. Reaching layer 2 opens advanced tutorial knowledge for First Aid, while arriving at layer 3 unlocks the Crafting course — see the beginner guide for ground crafting and inventory controls. Descending into deeper strata requires reliable navigation, as each level introduces increased environmental dangers and volatile obstacles.

Early Biomes from Gravel Lands to Overgrown Depths

An expedition begins when the drop pod touches down in the gravel lands, a rocky biome populated by basic traps. Surviving this initial descent leads into the deeper gravel lands, where trap density multiplies and hostile insects appear in greater numbers — the enemies guide covers countering stalkers and crawlers. Each transition forces players to adapt their movement and resource consumption.

Layer 3 transitions into the dried desert, an arid environment dominated by automated turrets, spiky cacti, oil deposits, and scarce water supplies. The wasteland introduces deceptive traps and hazardous rock formations, culminating in the overgrown depths filled with strange underground flora and fauna.

Layer Time Limits and Depth Modifiers

Exploration within any cavern zone is constrained by a strict time limit of 1 hour per layer. Once that window expires, a deadly radiation line advances across the map, compelling survivors to locate an exit tunnel or succumb to lethal exposure. Managing your route quickly prevents radiation sickness and forced panic during descent — the torch and lighting guide covers illuminating pitch-black shafts.

Special modifiers can also alter regional hazards. Certain layers feature ionized conditions that spawn antirad supplies nearby to mitigate toxicity. Furthermore, custom game settings permit players to modify trap frequency and loot availability per depth, raising trap density by 50% on subsequent floors to amplify survival tension.