Dungeon magazine 20

Dungeon issue 20 was released in November/December of 1989. It contained the following articles related to the Forgotten Realms:

The Ship Of Night

 * By Wolfgang Baur, Illustrated by Dave Sutherland. p. 6-25

An engineering marvel awaits you, as does a legion of "ghosts". Module for 5-7 PC's of levels 7-9.
 * Locations:
 * Settlements: Hammerkeep
 * Region: Underdark