CASUALTIES: UNKNOWN
BUILD 1.0.1

All 11 layers

The full game’s current Layers reference lists eleven layers: descend to the cargo on layer ten, then climb layer eleven toward the surface. A separate wiki overview still says twelve; that discrepancy is retained below rather than turned into an invented extra underground layer.

11 or 12

Steam and the publisher advertise eleven layers, matching the current Layers article. The separate Miraheze overview says twelve. Its count differs; no source read for this review establishes an exact reconciliation. The current route has layer ten as the deepest cargo location and layer eleven as the upward final ascent.

Shared rules

Layer table

Eleven-layer route · community data checked 12 Nov 2026
#NameEnvironment / resourcesEnemiesTrapsExitAverage °CMinimum °CMaximum °CStatus
1Gravel LandsCavernous, cold layer of small interconnected caves; light rock, gravel, soil and clay with groundwater pools.Shade crawlerGeyser, Jump pad, Spike trapBottom transition15.012.618.51 source · community wiki
2Deeper Gravel LandsDirect continuation of the gravel lands; main threats are darkness and flooding.Shade crawler, Cave tickGeyser, Jump pad, Spike trap, Barbed fence, Bear trap, Cave tick spawnerBottom transition17.512.521.41 source · community wiki
3Dried DesertSpacious cave of sand, sandstone and granite; tall drops make mistakes punishing.Shade crawler, Sand stalkerJump pad, Barbed fence, Bear trap, Turret, Stalactite, Landmine, Waste pipeBottom transition26.612.435.61 source · community wiki
4WastelandRadioactive layer sharing characteristics with the dried desert.None listed (radiation hazard)Jump pad, Turret, Coil, Stalactite, Landmine, Waste pipe, Sound cannon, Spent fuelBottom transition25.8-20.438.61 source · community wiki
5Overgrown DepthsOvergrown Depths (The Jungle): dense vegetation, edible plants, tree sap and groundwater; no turrets or landmines; Elder thornbacks. Continues to Frozen Chasm in full release.Shade crawler, Sand stalker, Cave tick, Overgrown tick, Tentacle-plant, Thornback, Elder thornbackGeyser, Jump pad, Spike trap, Bear trap, Cave tick spawner, Skullcrusher, Banana-plant, CoilBottom transition21.85.631.51 source · community wiki
6Frozen ChasmFreezing cold is the main danger; move between ion space heaters, heatferns and life-pods.Shade crawler, Snow striderGunmine, Turret, Spike trap, Fan trap, Geyser, Jump pad, Bear trap, Icicle, Ice stalagmiteBottom transition-30.6-33.0-24.01 source · community wiki
7Fungal PoolsFungus-themed tiles, traps and enemies; constant rain makes sleeping while wet deadly.Shade crawler, Cave tick, Overgrown tick, Grabber-shroomSawblade, Sidestabber, Dropshroom, Bear trap, Jump pad, Cave tick spawnerBottom transition17.814.223.21 source · community wiki
8Crystalline HollowBuilt around using some crystals and avoiding others; very large drops and a flying crystal enemy.ManifestationCrystal, GeyserBottom transition18.516.920.71 source · community wiki
9Geothermal VentsExtreme heat and magma; air pressure builds in the lower half and can cause barotrauma.Laser Drone, Cryo DroneSawblade, Piston, Fan trap, Bear trap, Lava Geyser, Lava lamp, StalagmiteBottom transition20.910.740.81 source · community wiki
10Where We Must ReachDeepest layer; cargo and drill-pod return. Air pressure rises; no layer modifier. Endless cargo returns to Gravel Lands.NoneSpike trap, Barbed fence, Bear trap, Turret, Ceiling turret, Landmine, Coil, Spent fuel, Sound cannon, Skullcrusher, Sawblade, Piston, Fan trap, Geyser, StalagmiteCargo / drill-pod return1 source · community wiki
11Crimson AscentFinal layer; the drill pod breaks down and the exit is at the top, on the surface.NoneNoneUp to surface1 source · community wiki

Layer 1

Gravel Lands is the first preparation area, with shade crawlers and basic traps. The current wiki now supplies simplified ambient-temperature curves for layers one through nine, replacing this guide’s earlier missing-data statement. These are published default curve values, not live measurements; layers ten and eleven have no numeric temperature panel in the source read.

Layer 4 radiation

Wasteland is the radioactive layer. The creature cell is empty in the notes. Traps include the sound cannon and spent fuel. This is the hazard the home panel points at.

Endless and the exit

On layer 10 you take the cargo and ride a drill pod up. In Endless the cargo sends you back to layer 1 instead of an ending. Layer 11 is a climb to the surface after the drill pod fails. The demo only has five layers and, per the wiki trivia, going below layer 5 loops you into Deeper Gravel Lands.

Steam store screenshot 6 of Casualties: Unknown
Steam store screenshot 2 of Casualties: Unknown

Questions

How long is one layer?

The default run setting is 60 minutes. Relaxed is 120 and Paradise is 180. The radiation line is what enforces it.

How many layers are there?

11 on Steam and on the publisher page. The wiki home page says 12. I print both.

Sources

SourceChecked
Steam store page2026-11-12
Oro Interactive game page2026-11-12
Miraheze wiki2026-11-12
Miraheze — Layers2026-11-12