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Fallout: New Vegas Hints
Find a way to cut off access to the sulfur.
1 of 7: Go to the north end of the hallway with the two overseer's offices in it and turn left to find a hall with two doors labeled "QUARTERS."
2 of 7: Go through the second one to enter the blue sector, then go along the corridor to reach the elevator to the Living Quarters area.
3 of 7: Stay where you are and let two fire geckos come to you, tripping some mines as they do. Finish them off, then go down the hall and turn left.
4 of 7: Past the next door, kill a couple more fire geckos, then use the big, steaming tunnel to enter the sulphur cave.
5 of 7: Go west at the first path split and kill fire geckos as you make your way to a large cave room with a big blue-and-yellow chunk of microline rock in it.
6 of 7: The microline rock is what you need to mess with for this objective, but the bad news is that you'll need a Science skill of 40+, an Explosives skill of 60+, and three C-4 plastic explosives to do what you need to do. You may just want to switch to doing Samuel Cooke's Objectives.