Kamikadze Cyber said:The manual states:
Fresco 2 - Use the elevator to right of the window and you'll come across an anchor you can use to swing across to the blue plant you grew earlier. Climb up, go forward and take a left at the lantern. Shimmy through the narrow cave entrance and when you're done shimmying, insert your rope into a slot and descend down to find your second fresco.
Shell 3 - Using your attached rope climb back up the way you came and shimmy through the entrance. When you find a ladder built into the rocks, climb until you get to top of the next surface and before moving by bringing down a bridge, the third shell lies next to some pottery and small watermill.
But after going down to the fresco, there is no need to go up anywhere; the passage further is right here, in the crevice.
I agree with Kamikadze Cyber. There is a mistake in Chapter 2 at shell 3.
If you were to follow these instructions there is no way to progress. You can see the area you are supposed to go to through a wooden barrier but the only way you can get there is through the cave hallway in the room with Fresco 2. If I were to rewrite this section I would say.
Shell 3 - Continue through a hallway connected to this room to find blue plants on your left next to a cliff. Echo and climb these. When you get to a ladder built into the rocks, climb until you get to the top of the next surface and before moving by bringing down a bridge, the third shell lies next to some pottery and a small watermill.