Borehole

The Borehole is an entirely underground mine sector, featuring a lava pit, numerous caverns flooded with muddy water, and heavy industrial machinery. The highlight of this area is the huge bore that the Strogg use to power up their excavations and equipment.

One of the machines powered by the bore is a large elevator that connects to two separate sections of the Drilling Area.

Quick Level Completion
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Walkthrough
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Differences from Easy to Normal
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Differences from Normal to Hard / Hard+
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Secrets

 * #1) Past the hallway with the Gladiator guarding the end, you will come to a 2-level room with a staircase leading down, with 3 Berserkers on the lower level. Deal with them, then look under the staircase; there are a couple of explosive barrels blocking access to your first secret, which is a suit of Combat Armor and some Rockets.
 * #2) Inside the same room, go to the shaft where there is an angled walkway at the bottom, and water on either side of it. Dive straight into the water (you will take a bit of damage if you land on the walkway) and swim to the bottom to find an Adrenaline.
 * #3) In the room where the objective is located, activate both of the switches to unleash a trio of Gunners who will try to ambush you. Two of them emerge from a section of wall that blew up when you activated the switches (a panel of wall directly across from where you entered the room from). Go inside here and shoot the back wall with a strange spherical-shaped design on it to open it, revealing the final secret of the map, with another Adrenaline, 3 Armor Shards and a "secret" rear entrance to the next map, Drilling Area.

Differences
Coming soon...