I first made a concept which would help me develop the mood, color, and prop list of the scene, but the 3D environment will not look exactly like this. It should look good for somebody who would be walking into it, like in a game. Open to suggestions though!
I've started the blockout, added particles and sound. Next up is another pass at textures and some animations in the tentacles! (which I also need to add more of the tentacles still) My goal is to make it feel alive. As if it were implemented into the game build, working and navigable. The period is around 1930s, with hints of lovecraftian spookiness.
Here is a video of it with effects and sound!