A real time environment in UE5. I used Houdini to create all of the geometry—basically a large set of rocks and stalactites—and used PCG to place everything that isn't structural. PCG is really lovely for quick repetitive tasks such as, say, placing several thousand stalactites automatically on the ceiling. Everything is Nanite and extremely triangle dense. The water is using Unreal's single layer water shading model which is super easy and gives a pretty nice result with almost zero effort.