Risen Finding Titan Sheild

I am stuck trying to get the second lizzard bust from inside the temple. I already have the one where the trap door is. Need to open the gate to be able to get it not sure what i am missing maybe a switch somewhere.

Can you describe the temple a bit? I always get confused as to which temple holds which artifact.

The area is in chapter 3. You enter the temple from the side, and go past where fire comes out of the floor grate. You break through the door (right before the spike trap and fire trap) and kill a guard. You then kill two more lizard men, one has the bust on them. Where is the other bust to be found? I know the area because I'm stuck in the same place.

I searched through the entries and you should take the north tunnel. at the place you kill two snails (can't remember their name) you use the spell to change into one and take the small tunnel at the back of the cave.