AcetheSuperVillain
Great stuff. Annoying that it's only set up for Unity, but it's a fine collection, feels very complete.
Package contains modular metro style tunnels and rooms to build large or small levels for FPS.
Set includes Demo scene and more than 150 prefabs: Tunnels,rooms,Pipes,vent shaft,fuse boxes,lamps,some wooden constructions,doors, monitoring panels,wooden and paper crates,garbage,crystals,cabels,spiderwebs,barrels,planks and some particles...
Doors,valves,monitoring panels and one fuse box have open and close animations.
Almost all textures are 4096x4096 resolution atlases.
P.S read readme file in package's documentations folder.