"Escaping mind flayer ship" seem like a little overstatement, when i remember that rock that hits Tav in the face before he fall off.

Also im kinda unexperienced in DnD, but shall we really presume that the first second you step over the border of Underdark, horde of Undead, Vampires, Drow, Duegar, Mind Flayers, and other abominations ... will attack you? :-/ Come on man, surely even Underdark is big enough to have at least few caves that are more or less, well at least not as deadly as the rest, if not exactly "safe".
Still Underdark in BG3 is one of most chalenging parts of Act1 so far ... maybe except Githyanki patrol. :-/