How in Avernus did I totally miss this secret treasure-stuffed shortcut to the Underdark in Act 1 of Baldur's Gate 3 no less than seven times?

I've played Baldur's Gate 3 a lot now. And, let me tell you, I've played through Act 1 more times than a lot. I just can't help creating new characters! This restart-itus has become even worse recently, too, thanks to me delving into the world of Baldur's Gate 3 cosmetic mods, which are letting me take character aesthetics to a whole new level...
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