There is an Underdark but is there a Undersea (Realms at the bottom of the Oceans) in the forgotten realms? I have an idea of a setting but didn’t want to pursue if there is something already in place. Yes, but utterly undeveloped in print (something TSR set aside because "Undersea won't sell," although Jeff's original proposal for a universal setting had an Undersea Adventures listed along with Jungle Adventures, Arabian Adventures, etc.). So go right ahead!!!

— Ed Greenwood (@TheEdVerse) November 23, 2018

@StevenESchend What would it be like? tackled undersea adventures in the Realms in one of the best (but most underrated) sourcebooks of the 2e Realms: Sea of Fallen Stars. Realms and D&D specific, and I love it.

— Ed Greenwood (@TheEdVerse) December 9, 2018

Only swimming in the wake of those who taught me, @TheEdVerse

— Steven Schend ☃️🦌🎅🏻 (@StevenESchend) December 9, 2018