
TREASURE #4: Face the door with the ornate disk puzzle, and then turn the camera to the right, up towards the ceiling. One axel is located right in front of the door on a pedestal pick it up with the Y button and use it on one of the two bottom disks. Inside the cave in the large peak is a door with "ornate disks" a puzzle with that requires two "axels" before it can be attempted to solve.The treasure is in a small niche in the surface of the peak, near the top. TREASURE #3: Face the cave entrance to the large peak, and swim straight up along the peak's surface.

TREASURE #2: Just past the structure containing Treasure #1 is another structure with a small entrance under a rock "bridge". There is a hidden cave entrance, obscured by seaweed Treasure #1 is lying in an alcove further inside. TREASURE #1: Before swimming into the large peak ahead, swim towards the smaller one towards the left. Watch out for sharks if any approach, lock onto the target with the left trigger and shoot them with the harpoon gun. If you become lost, press the Back button to access your PDA, then use the Sonic Map to create a 3D render of the immediate area. There is a cave at the base that can be swum into.

YouTube: Tomb Raider: Underworld - Mediterranean Sea: Path to Avalon (Time: 5:25).A cutscene will trigger, ending the level and unlocking the Prologue achievement. Move forward and when prompted, walk off of the nearby edge, and press B to drop down.Swing over the inferno towards the other side of the atrium if need be, rock the analog up and down to give Lara more momentum. With the grapple still in place, make a running jump off of the broken stairs in the direction of your grapple.Make a running jump over the hole in the round, then continue down the atrium.Shimmy over to the right as far as Lara can go, then hold right on the left analog and press A to jump to safety.Jump onto the box and use it to reach the crown molding above.Push the box forward so that it is placed underneath the section of crown molding on the wall straight ahead. Use the left analog to push and pull the box press right or left on the analog to turn the box in a different direction. Approach the ornate box and press Y to grab onto it.Shimmy to the left, then when prompted pull down on the left analog and press A to jump to safety.Continue shimmying to the left, then press B when prompted to drop down.Shimmy and then press A to jump upwards when prompted.Face the wall opposite and jump towards it, clinging onto the crown molding. Walk towards the cliff on the same side of the hall as the doorway.Look for a health pack just past the doorway Press Y to collect it. Continue forward into a hall divided by a burning pit.Use the right analog to face the camera towards appropriate target (the nearby closed door) then press X to fire the grapple, then Y to yank the door open. Note that a blue symbol will appear on the edge of the screen this is a hint prompting the player to turn towards a target that can be grappled.Climb onto the flat pile of rubble past the wreckage.Press Y to throw the switch and open the door.

Once the cutscene ends, proceed forward down the flaming tunnel.
