Go back to the main cave, head up the stone steps and turn left to cross the bridge. Slide down and sprint to the left to avoid the spikes and wait until the room fills with sand. Pick up the golden serpent and escape through the open gate on the wall. Push the statue onto a blue-and-red square on the floor and follow the corridor. At the sarcophagus, pick up the Amulet of Thorns and follow the streams of blood into a room with a statue in the centre.
Pick up the Hand of Orion and jump through the spike traps and down a slope where you can place the object in a hole in the wall.
