Can only assume most beta players didn't get this far - the main faction quest appears to be irrevocably bugged for all players preventing progress through this area and beyond, another key quest is also bugged for all players (did someone forget a barrel??). Of the other quests I have found at least two more with fatal bugs.
I, and others, have bug reported in game but just needed to express how tragic it is to have the core quest bugged so badly, you learn to expect it from Beth when it comes to side quests and accept that fixes may both take a few days and break other things BUT to have not fully tested the main quest for eachy faction seems extremely sloppy.
I feel like I am still beta testing...
Let the patronising comments begin