Level 15. Coolie Mines

Start the level in front of a bridge. Small medikits are behind you to the left.

As you step onto the bridge, two doors will open from the sides, revealing turret guns. Destroy the turrets or jump to the other side to grab the Uzi.

One turret has a RED KEY behind it. Jump to that side, grab the key, and return to the bridge.

Continue into the Coolie Mines. At the other end, find and grab the BLUE KEYCARD.

Head back out and turn right, proceeding down the other path while killing rippers.

Continue down the path, past a drill, until you reach a red key door. Use the RED KEY to open it.

Hit the switch on the left to activate a lift. The Serpent Boss will appear on the lift. Defeat the boss.

Take the lift down. Ahead is a blue key door. Use the BLUE KEYCARD to open it.

Proceed down the path, past another drill, and kill enemies.

You will encounter an out-of-control drill. Break the window and go through. Avoid being touched by the drill as it can cause significant damage and knock you back.

Continue down the path until you reach two fans. Break the fan that is NOT working and go through it.

On the other side, hit a switch. This will launch you upwards. Ensure you move forward as you ascend to land on the water safely. Landing without moving will result in a damaging fall.

Once in the water, defeat the wasps and a Serpent that appear.

Head for the large steel door to complete the level.