This is a paid asset, but now you can download 3D Scifi Kit Vol 3 Free.
Detail this asset from Unity Store: Original Link
3D Scifi Kit Vol 3 v1.15 (Latest version)
With 3D Scifi Kit Vol 3, you will able to create nice scifi interior or exterior levels for your games!
OFFICIAL FORUM THREAD
NEWS: The update 1.15 is released!
You need a level for a spaceship scene ? a moon base ? You can use it for topdown or FPS projects. The kit is a large set of meshes pre-configured prefabs (with sounds/particles etc) you will find more than 350 meshes, and a set of more than 500 prefabs.
The kit has NOT been optimized for tablets but for pc and mac. The atlased textures are optimized and provided in 8k size to keep a very good quality on pc and mac. The flat textures are provided, to help you to make your own (with Quixel DDO or other program that accept ID textures).
This version is a full PBR version, diffuse, normal,ao,illum,flat, and metal maps are provided. Creating rooms, corridors or exterior levels with the kit, is very easy! The example map is provided with the pack.
If you liked the volume 2, you will like the 3!