This is a paid asset, but now you can download Modular Underground – Horror FPS Environment (HDRP) for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Modular Underground – Horror FPS Environment (HDRP) v1.0
Create stunning and realistic abandoned environments – perfect for any kind of horror and FPS game – with our Modular Underground Environment and the High Definition Render Pipeline!
With our Modular Undergound Environment – created for the High Definition Render Pipeline – you get all you need to build stunning underground environments for your games. The asset pack contains highly modular structural pieces and beautiful props, that you can use to create a large variety of scenes, like abandoned interiors, basements or military environments. The included set of decals, like dirt, leak, pebbles and damage decals help you to break repetition and push your environment even further! With its abandoned look, this environment pack is a perfect fit for any kind of horror or FPS game.
Features
Modular structural pieces (walls, doors, floor, ceiling)
High quality props (shelf, locker, beam, barrles, pipes, cables, pallet, boxes)
Decals (dirt, pebbles, leaks, crack and damage)
High quality 2K textures
Number of textures: 80
Texture dimensions: 2K
Number of meshes: 25
Number of prefabs: 33
Minimum polygon count: 8
Maximum polygon count: 4500
LODs: 9 (count), 2-4 (number of levels)