Pavillion
this was the largest of the underwater cities built by the Iskalonians on their homeworld of Iskalon. The city was destroyed when an Imperial missile was launched from the citadel on Gamandar, shortly before the Battle of Endor. The missile nearly hit the Millennium Falcon, which was carrying Lando Calrissian, Chewbacca, and Mone on a mission to infiltrate the Imperial citadel on Gamandar. The missile struck a remote section of Iskalon's ocean, and the Iskalon Effect took over swiftly, creating a huge tidal wave. The immense pressure of the tidal surge smashed much of the transparisteel that formed Pavillion's outer walls, flooding the city and forcing a complete evacuation of any non-Iskalonians.