The war within quest Putting the works in waterworks

I was doing the world quest “Putting the works in waterworks” on my mage Nyala. I did everything in order I activated the 2 waterwheels, then entered the delve “The Waterworks”. After killing everything in that first room, getting loot and activating the air things I couldn’t go any further, the door wouldn’t open to do the rest of the delve. I abandoned the quest and went to get it again. It did the same thing; it won’t let me past that first room. I have to finish that delve to move on in the world quests. Any help would be greatly appreciated.