Tomb Raider: Underworld - [Mediterranean Sea] - Niflheim - part 1 - game guide, walkthrough, secrets, game tips & strategies

Jump over rubble, which is located behind the bend of the corridor.

Go under the rocks and begin moving left using the ledge. In the appropriate place, slip down to the bottom of the hole, and move through low tunnel, which is located there.

You will find yourself inside another hole. Jump on the fallen rocky block.

Clutch the ledge, go out of the hole and run through corridor.

Unfortunately the next gate will be blocked by huge cracken which is waiting on you in the water, opposite the entrance. It is rather safe and will be able to attack you only in few strictly-defined places.

Move to the corridor, which is located on the right side, just before the room with cracken. Then use the ledges on the left side to pass to the other side. Then turn left and jump over the hole, using the ledges on the left side.

You should reach the place from which three columns are visible. Jump on the nearest one. Then turn yourself around. The next column should be located behind your back. When you do this, jump in the direction of this column.

From the second column, jump onto the third. Then jump in the direction of the ledge with tentacle of the cracken. Use the ledge to move yourself right and climb on the rocky shelf.

In this moment, the cracken will attack you. To make things easier, for moment you will be in bullet time mode. As fast as possible (before the cracken will destroy this place) jump on the bar, and then on the footbridge, which is located on the other side.

Use the footbridge to move right, to the room with transmissions. As you are not able to do anything there in this moment, approach to the edge.

Jump on ledges to the right. After a while you will reach the bottom.

There use your grasper to pull out the metal roundel. After that return to the upper level. The way to surface is illustrated with the arrows on the second picture.

Approach to the switch, which is located near the ledge and activate it. After that the footbridge will move away from the spiked bowl, which is located above the head of the cracken.