DOCTOR: Well, here we are. The Vault of the Eye of Harmony. Let's get unpacked.

ROMANA: The atmosphere here. You can feel the power, can't you?

DOCTOR: The secret power of a syphoned singularity, the sacred heart of the Time Lords.

ROMANA: And we're reducing it to the equivalent of an electric socket.

DOCTOR: Well, that's all it is when you strip away the mystical mumbo-jumbo. A phenomenal power source.