Guards! Guards! Corgi Audio Books 1995 ISBN 0-552-14012-0

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 …