Guild Wars 2

I have looked into it and apparently it requires that you complete the Tribulation Rift Scaffolding puzzle to gain access and I have. It still will not let me into the cavern.

Where do you expect the entrance to be??
The reason I’m asking is that the entrance isn’t blocked or unlocked or anything. I suspect you think the dwarfen door under the tribulation rigt puzzle chest is the netrance (or alternatively the room where the reward for killing the dredge commissar is. However, the entrance is high up, on the same level as where the chest for tribulation rift is. It is always open, the only reason you have to do the rift puzzle first is cause the entrance is next to the chest.