Modeling the interior i knew wouldnt take long.

I used a cylinder with about 24 edge loops and scaled in every other edge loop to get the ridges.

Just as a guide i’ve added in a plane for the water and texted it blue, just while i’m modeling.

To get a nice gentle curvature I used a bend deformer from the animation menu and deleted the history to set freeze the deformation.

So the main shape is done, I just roughly imported my tables in to see what it would look like. I now need, lights, water, mist and my aliens.