A view from the side with:
Yellow circles = light sources
Red and white circle = 3D cursor
Pink triangle at right = camera position looking through tunnel
Working grid, green line = y axis, lavender line = z axis, two of the three 3D world axes.

The Alchemy complex grew from three meshes. At left, the deformed cylinder becomes the room. The tunnel floor is seen to be a subdivided and extruded mesh cone. The tunnel itself is a group of vertices spun about an axis to form its symmetrical 3D shape.

From above:

See it in perspective.