Another cinematic follows the introductory credits.  It opens with Lara's boat floating on the Mediterranean.  The caption reads, "One Week Earlier." Lara hears a beeping climbs down into the boat's cabin to activate her laptop computer and speak with her colleagues, Zip and Alister, over a satellite uplink.  She says she hasn't made much progress yet but thinks she's close to finding the entrance to Avalon, which her father believed was nearby.  Alister warns her not to lose perspective.  After all, the odds of finding her mother still alive after all these years are remote at best.  Lara agrees but insists she must still search for the truth.

ON THE SURFACE: You regain control with Lara standing at the stern of the cabin cruiser.  On-screen text indicates that a journal entry has been unlocked.

NOTE:  Lara keeps a journal in her PDA, which also includes game hints, inventory, weapon selection and other features.  For more info, see the section on the PDA on the Underworld Controls page.  Lara's journal entries provide additional information, which may be helpful in your explorations.

SUBMERGED RUINS:  Jump off the back of the boat and swim downward toward the ruins below.  Lara automatically equips her scuba gear.  As you explore, you'll encounter 3 sharks.  They won't all attack at once, but you should keep an eye out for danger.  If you want to, you can swim around the open water a bit to locate and kill them before you turn your attention to the ruins.

NOTES:  Lara's pistols now work underwater, but she also has a spear gun and sticky grenades that can help make short work of the sharks.  For information on choosing and using weapons, see the Underworld Controls page.

Throughout this area you'll want to make use of Lara's Utility Light.  To turn it on and off press Delete (PC) or D-Pad down (PS3, Xbox).

The entrance to the ruins is located within the stone tower.  For players who prefer to cut straight to the chase, I will first describe the way in.  Then, if you want to explore further and collect the various hidden treasures in this area, those instructions will follow.

NOTE:  For more information about treasures and relics, refer to the introduction to the Prologue waltkhrough.

UNLOCKING THE PUZZLE DOOR:  Swim to the base of the rough, vegetation-covered stone tower.  Go through the wide doorway and down into the room below.  Try to avoid the luminescent jellyfish, as their stings are poisonous.  Ahead is an ornate, metal door mechanism consisting of three interlocking circles.  One of the circles has a wheel-shaped handle at its center.  The other two are missing their handles.

The first handle is lying in plain sight on a small stone pedestal just in front of the door.  Swim down to it and press Interact to pick it up.  Swim up to the metal door and position Lara near the center of one of the circles with no handle.  Press Interact to put the handle in its place, but don't turn it yet.  It'll be easier to solve the puzzle with all three handles present.

If you're not interested in treasures and want to go straight to the second handle, turn around and swim out through the door where you entered.  When Lara is just outside the door facing out along the sea floor, ahead and a bit to the left you'll see an overgrown mound with a small, rectangular doorway.  That's where you're headed.  Skip down to the section SECOND DOOR HANDLE, below.

If you are collecting treasures, instead of exiting the puzzle door room the way you entered, face the puzzle door and swim upward through the opening in the right side of the ceiling.  Swim up through the rocky tunnel.  When you near the top, turn around and look down to spot the treasure (1/26) lying on rock shelf.  There's an audible chime as you swim close to it, indicating you've found something special.  Press Interact to pick it up.

Continue upward and out of the tunnel.  As you emerge on the sea bottom, turn left and swim toward the overgrown mound with the small, rectangular doorway.

SECOND DOOR HANDLE:  Swim through the doorway into the ruined room below.  Watch out for the stinging jellyfish as you swim forward and downward beneath the jutting rock slabs.  At the bottom of the room, turn right and continue forward.  At the next turning you'll see the second handle on another small pedestal off to the right and a jumble of boulders on the left with an opening where you can swim through.

Swim through that opening into the sandy area beyond.  Turn right and you'll see the treasure (2/26) lying on the floor near the wall.  Take it and swim back out under the slab and straight on toward the handle.

Pick up the giant and carry it back to the puzzle door within the stone tower.

NOTE:  If you haven't already killed the 3 sharks, watch out for them as you make your way back to the door carrying the heavy handle.  Normally you can press Crouch to drop an object, but here that control is used for swimming.  So if you are attacked, just fire your weapons and Lara will automatically drop the handle.  Be sure to note where it falls so you can pick it up later.

OPENING THE DOOR: Place the second handle in the empty hole at the center of one of the metal circles.  With all three handles in place, you're now ready to solve the interlocking circle puzzle.  Examine the carvings on the eye-shaped segments that make up each circle.  Some have flat lines in their centers.  Others have bulls-eye designs.  The goal is to rotate the three circles so that the segments that make up the top center circle all have bulls-eye designs.

If you haven't turned any of the handles yet, this is not difficult.  First, swim close to the handle at the center of the top circle and press Interact to turn it once.  Then turn the left handle once.  Then turn the right handle twice.  When you've solved the puzzle, the door opens.

NOTE:  There's an autosave checkpoint just inside the door.  If you want to go hunting for treasures before going on, you may want to swim through and use that checkpoint first.  If you don't care about collecting bonuses, skip down to the section titled ENTERING THE RUINS, below.

TREASURE HUNTING:  There are a total of six treasures scattered throughout these ruins (26 in the entire Mediterranean level).  If you've followed this walkthrough so far, you've found two of them.

The third is located in another underground chamber.  Swim out of the puzzle room through the wide door where you first entered.  Turn right and look for a rough mound overgrown with seaweed.  Behind the seaweed is a doorway.  Swim through it and then down and to the right into the room below.

NOTE:  It's quite dark in here, so if you haven't done so already, turn on Lara's Utility Light.  To turn it on and off press Delete (PC) or D-Pad down (PS3, Xbox).

Swim forward through the rectangular doorway.  Ahead on the right you'll see another pedestal, this one empty.  It was probably made to hold the handle that was already in place when you arrived.  Turn around so the pedestal is behind Lara.  Then swim through the opening above the pile of rocks straight ahead.  In the area beyond, there are 3 jellyfish.  The treasure (3/26) is below and to the right of them.  Take it and swim out the way you came.

The next treasure is located on the side of the tall stone tower.  Swim toward it and face the side with the big doorway.  Now imagine the tower is a huge, elongated head.  The doorway is the "mouth," and partway up the structure on each side there are two flat ledges that resemble eyes.  The treasure (4/26) is lying on the ledge on the left.

Turn around so the stone tower is behind Lara.  Now swim out toward the right edge of the ruins and look for a tumbledown structure with long, rectangular stone slabs.  The entrance is located on the side farthest from the stone tower beneath those slabs.  Swim inside and follow the dark tunnel to a room with a sloping pile of sand.  The treasure (5/26) is lying in plain sight.  Grab it and swim back outside.

The sixth treasure is located on the far side of the ruins.  Swim back toward the stone tower and then past it toward the left edge of the ruins (i.e., left when facing the tower).  Look for another structure with flat stone slabs canted above the opening.  Swim beneath the rough archway formed by the fallen blocks to find the opening.  Follow the dark tunnel (again, use the Utility Light if you need it) to find the treasure (6/26) lying on the floor beneath a group of jellyfish.

ENTERING THE RUINS:  When you have everything, swim back to the stone tower and go through the puzzle door.  Try to avoid the jellyfish as you make your way along the corridor.  It twists and turns but does not branch off, so you can't get lost.  Just keep going forward.

When you come to a place where the passageway turns to the right and is partially blocked by a jumble of rocks, swim over the boulders and then turn around and look back in the direction from which you came.  There's another treasure (7/26) on the floor to the right.

Pick it up and continue forward until you reach the round hole with the huge tentacle sticking out of it.  This appendage may swat at Lara but it shouldn't injure her.  Now any normal person would probably say "no thanks" at this point, but you're Lara Croft, so swim through the hole where the tentacle went and make your way upward to the surface.

Climb out of the pool on the low ledge and then vault up into the doorway.  Ahead is a larger room carved out of rough stone slabs.  On the right there's a cluster of breakable ceramic jars.  Stand near them and press Interact to smash them.  The rounded one contains a treasure (8/26).

On the opposite side of the room there are two step-like ledges.  Climb up and over them to reach the next room.

ROUGH STONE ROOM WITH POOL AND LEDGES:  The exit from this room is on the right, but the ledge there is too high to reach from the water.  So you'll need to find another path.

First hop into the water and swim down to the far left corner of the room, where you'll find another treasure (9/26).

Use the sloping stone ramp to climb out of the water.  Ahead on the left there's a shelf with a health potion.

NOTE:  A health potion works just like the first aid kit you found in Croft Manor.  Stand near it and press Interact to add it to your inventory.  Then, if Lara needs healing, press the Use Health Pack button.  Keep in mind that Lara heals automatically over time, so if you're not in any immediate danger, wait and conserve your health items.

In the corner ahead (i.e., the far right if Lara's back is toward the entrance), there's another ramp and a series of ledges.  Climb onto the lowest corner ledge and jump up to grab the handhold on the side of the tall, square block in the corner.  Climb around the corner to the right and continue climbing to the right until the corner block is behind Lara.  Jump up to grab the handhold above.  Then jump back to grab the top of the corner block.  Pull up to find 2 breakable jars.  Again, press Interact to smash the rounded one, revealing another treasure (10/26).

There are three wooden poles sticking out of the wall to the left.  You can ignore these.  They're just another way up from the floor below.  Instead turn around and jump back across the gap to grab onto the previous handhold.  Climb around the to the right until Lara's back is toward the single horizontal pole.  Press the direction key that makes Lara lean away from the wall or, if you're using a controller, or push the stick in that direction.  (i.e., to the right if the camera is on Lara's left, Back if the camera is behind her).  Then jump in that direction to grab the pole.  Now move the camera behind Lara and press Forward to swing around the pole.  Just as Lara starts to swing upward, press Jump to let go and grab the handhold ahead.  Climb around the corner to the right and drop down three times to reach the floor below.

BIG DOOR WITH PRESSURE PADS AND SERPENT HEADS:  Opening the way to the next area requires a little ingenuity.  The switch on the low platform in the middle of the room does not function yet.  To make it work, you'll have to depress the 2 pressure pads on the floor below the serpent head statues.

First, stand facing the serpent head on the right, a little ways back from the pressure pad.  Grapple the metal ring on the snake's head and press Interact to pull.  You'll need to tap the button several times to pull the head loose, but when it falls, it lands on the right pressure pad, holding it down.

Now locate the 2 small, carved stone blocks on the floor between the pads.  Use Interact to pick one up.  Carry it over to the left pressure pad and press Crouch to set it down.  Repeat with the second block.  Together, the two are heavy enough to hold down the pad.

NOTE:  In the PC version, at least, this section is a little buggy.  Sometimes the blocks bounce away crazily when you set them down.  I found it helps to stand Lara on the pad facing the middle of the room, rather than the wall, when setting down each block.  In any case, just keep trying; it'll happen.

Once you have both pads depressed, climb onto the low platform and pull the switch to open the door.

Cinematic:  Lara examines the carvings and finds them to be early Germanic in design, yet somehow much older.  She deciphers the runes: "World of Mist," which she takes to mean Niflheim, the Norse realm of the dead.

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