The eighth Discworld novel - After this, dragons will never be the same again!
This is where the dragons went. They lie . . . not dead, not asleep, but . . . dormant. And although the space they occupy isn´t like normal space, nevertheless they are packed in tightly. They could put you in mind of a can of sardines, if you thought sardines were huge and scaly. And presumably, somewhere, there´s a key . . .