Hop off the Skylift and walk around the ledge to collect plenty of guns and ammo. Waik through the tunnel ahead.

A new type of enemy, the Krall, will be waiting on the landing. Kill him then go back and open the door. Follow this branch of the tunnel, kill the Krall and carefully climb the stairs.

Kill the two Krall in the next chamber, collect the Healing Fruit and ammo along the banks of the river then dive in. Swim under the waterfall and climb out into the small chamber.

Push the lever and swim back to the chamber. The lever opened the bars at the end of the stream; swim through, climb out onto the landing, enter the tunnel, then hop onto the lift at the end.

Follow the corridor and carry on till you reach the bridge outside. Kill the two Krall on the bridge, enter the next tunnel, continue up the shaft and cross the bridge that runs over the stream below.