As the topic suggests there may be possible spoilers if you havn't seen this puzzle yet, if so please leave now.
There maybe possible Spoliers aswell, whatever they are

Hey guys, i've just hit the Watery Depths part of chapter 3-5 and may have found some bug/glitch just wondering if anyone has noticed or ran into this.
To clarify i'll list what i've done in this place so far

Gone in - Caddoc opens the "wall that sounds hollow" -retrieved the key
Proceeded into the first spiral room, listened to the Ancient ones riddle
E'lara shot the boat, lighting "wet logs", turned the first wheel.
Shot the brazier, lit up a side passage
Gone into the room with the mechanical bridge, killed a few skeles
Pulled the lever so Caddoc could cross, burned the tapestries - found 2 secret rooms
turned the wheel 3 times, water level dropped
gone back into the room with the book/hollow wall, killed an elite skele
gone down the stairs where the water was, i assume this is the part about "wet logs lighting the way"
gone into the tunnel, spider bursts out attempts to munch someone, when freed retreats into a hole in the ceiling
looted the stuff down there, went into the spider tunnel, attempted to shoot the claws in the ceiling (green circle) nothing happens
procceded into the tunnel, ran to the top and found the exit, objective still incomplete
whenever i go near the entrance Caddoc mentions that something may still need finding

EDIT: after killing the Elite skeleton, theres a red flash that appears every 2 seconds or such, cant seem to locate the source of it

i've ran through this place on both chars now, for a good 2 hours reloaded 3-4 times and still can't find what i'm missing. Is there some super secret to this place? or is this down to a bug or glitch?

From what I gather you`ve already looted everything. I might have missed something, though. I`ll try redoing this one aswell.

Let me know if you find something. I`ll do the same.

P.S

Have you done Hot Heads? The quest where you light the stone heads in the right order and then push a wall to reveal a secret room?

aye, that part has nothing to do with the Watery depths

Yeah... well, I`m not finding any treasures.

There are, however, a few interesting anomalies I experience when in that dungeon. After I light the boat, turn the wheel three times and go back to the entrance of the tunnel that was previously under water, I get an option to press E and look at a "point of interest". My camera turns to the chamber where the book (questgiver), hollow wall and berserker skeleton are. This happens only once and once it has happened, I don`t get the camera option again... untill I restart the whole thing. However I do have the red flickering light on wall thing. It`s funny, the E option pointed my camera towards near that wall, maybe the wall next to the flickering one.

Also when you go towards the end of this quest through the tunnel where the spider snaps one of you, you can see that behind a web there are two objects that looks like eggs. I could swear that my marker went green when I pointed at them. Shooting them provided little to no result, however, aside from the marker going yellow again. I suspect that this might be the same spider and it is just an bug where it doesn`t dissapear completely. The egg-like objects might be pincers or some part of the spider.

You know I went through and had no trobles here. I have had problems in other areas though.