That's what we were told. That we would be going to the cathedral. Shortly afterwards we were at Devil's Throat. I don't know if the DM missed the drop, or what. They weren't very far.
I'm not here to name names. They are a very respected op on this board though. If you really want to know, PM me. I'm not posting it publicly.
The cathedral is not a typical swim through. It is a very large room. If you did not find yourself in a very large room, then you were not in the cathedral.
The Devil's Throat enters at about 95 feet and then drops straight down, like going into a well. You exit through a fairly large opening, so it could be anywhere from 120-130 when you exit, depending upon how close you stay the the ceiling.
The Devil's Throat formation is extremely complex, though. It is honeycombed with swim throughs. Many operators will just do the throat part of it, and divers don't even know the rest of it exists. I have been on a couple of dives there, however, in which we spent all of our bottom time (on steel 120s) weaving our way through the different swim through options there. It is possible that your operator did one of the other swim throughs near Devil's Throat and then took you through the throat.
Either way, it does not sound as if your group was really prepared for this dive.