Defence
After stomping on the two grubs, you will reach a chamber with the vortigaunt and two members of the resistance (Sheckly, the solder, and Griggs the medic). They will explain the current location, proving information on how to setup defences.
The area has four entraces. From left to right, the Breach (a burrowed tunnel by antlions), 36 (where you entered), 12, and 24.
There is an shotgun ammo crate between the breach and 36, and an SMG ammo crate near the forklift at 24. Mines are located to the left of the breach, as well as left of 24.
You may want to pickup the Smg near the vortigaunt, although the NPCs will let you know.
The place was quiet before you showed up, and the antlions are chasing after because of your progresson the Get Some Grub achievement.
Waves:
- 1 light from 36.
- 1 light from the breach.
- 2 lights from 24
- 1 light 36, 1 light 12. Sheckly and Griggs will cover 36 - move the turrets over to 12.
- 1 light breach, 1 light 12, 1 light 24.
- 1 light breach, 1 light 12, 2 light 24.
- 1 light breach, 1 light 36, 1 light 12, 1 light 24
- 1 light breach, 2 light 36, 1 light 12, 1 light 24. Both turrets break during this wave.
At this point, 3 lights appear on 12. You will see a few dead antlions falling, before vortigaunts arrive. Use this time to plant any remaining mines
The final wave will have 3 lights on all tunnels. The antlions will swarm, but are cut to shreads by you and the reinforcements.