Hey Ed! I think I may be misremembering, but was there an abandoned dwarven colony or stronghold beneath the sea, with a tunnel leading to the mainland? Perhaps under the Sea of Swords? Yes, there are several. Some are mining complexes that ventured out deep under the sea. @StevenESchend is your leading loremaster for such, though one shouldn't miss consulting @gkrashos and @EricLoganBoyd on such matters, either!#Realmslore

— Ed Greenwood (@TheEdVerse) April 23, 2019