Jump across to the other side using the rope and then jump onto the lever. Get out of the jeep, kill the tuareg and climb to the top of the right-hand scaffolding. Keep driving until you get to the closed gate. It's not a race against the other car, so just follow the track. Kill every bugger in sight, one of which will drop a set of keys you can use to drive the jeep. Put the Hand of Sirius there, collect another golden serpent and enter the temple doorway. Pull the lever and head back to climb up to the star-shaped hole. Go where there's a hole in the wall in front and below you, and go in. Return there, slide to the floor and pick up the Hand of Sirius. Go through the freshly opened gate and keep going to the next lever, which rotates the main room. Drop down the hole, head under the spikes, climb the blocks and pull the lever.
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.
