- Ian Chesterton: Oh, it's enormous.
- Barbara Wright: Look at the joints in the blocks, Ian.
- Ian Chesterton: Yes. No Mortar. It must have been built with tremendous accuracy.
- Barbara Wright: Yes. The Egyptions did the same thing. So did the Indians of Central and Southern America.
- Barbara Wright: So the men from the glass submarines are intruders like us?
- Dr. Who: Yes, but with one difference, which is puzzling but releaving. They died, but we're only prisoners.