PERI: Wow. This is incredible.

ERIMEM: What are they all?

DOCTOR: Tardises. Or should that be Tardisi? Tardi? I'm never sure.

ERIMEM: But there are hundreds of them. What are they doing here?

DOCTOR: The relationship between Time Lord and Tardis is intricately woven. Once cannot exist without the other for long. When a Time Lord dies, their Tardis dies with them.

PERI: Then this is like an elephant's graveyard, only for Tardis-seseses.