I just remembered a scene from a somewhat old sci-fi cartoon series or movie but Google only brought me here so I'll give it a try.
What I can remember: a lot of robots walking down a tunnel or corridor in line, chanting some name or something (of their god?). After they stopped, the corridor began tilting forward, so the robots began to slide down the corridor, slowly becoming a hole.
My memory of it is very vague, but I think the corridor had a half-round ceiling like a car tunnel and was made out of grey bricks. The robots were grey or blue with noodle-like arms and legs (think Bender from Futurama). I think I can remember that there were big and small (child) robots and the protagonist tried to save them. It was a somewhat sad scene.
What I mean with old: at least pre-90s, I think maybe 70s or 80s. As I said my memory of it is pretty vague, I was only a child then.
Additionally, I think the art style was maybe similar to Captain Future or Akira.
The robots I remember where more cult like, they were waiting to finally go into this corridor and meet their maker I think. Like they where sent there to die.