I have recently started playing through the Sundered Keep mod. I am playing through the Pirate's hideout and I have got to Witherstone caves excavation area. I can't see where to go from here. The quest update does not make it clear. I think I have killed all the pirates I need to. I can't find a way out to progress to the next stage. Can someone advise on where to go or what to do? Thanks if you can help.