Right before it hits zero, a bunch of security guards will swarm you all of a sudden: automatic weapons or shotgun will work best here. The timer that appears that in the corner is the time it will take for the copter to arrive, not the mission time, so now you're actually wanting it to tick down. Stealth is no longer that useful, so just whip out your best gun and shed some blood. Now Carlos is coming with a helicopter, and you need to get to the marked helipad. (We wound up shooting our way to it, picked it up, and were shot up by the cops when we restarted from the checkpoint, we were right where we died, without the plant security on us. Get to it however you can, and you'll get a checkpoint. The barrels you need are in a building on the east side of the island, essentially forward from where you docked your boat. Either way, as long as you have the Geiger Counter equipped, you get a meter that shows radioactivity in the area: the closer you get to toxic waste, the more radioactivity it reads. The game recommends you use stealth here, although it's possible you can shoot your way through it.

Now, you're looking for toxic waste here. Hop in your boat, then head over to the power plant. (You may as well load up on ammo while you're here too.) Hop back in your car, then drive to the marked dock. Enter, then hit the marked button at the shop to buy a Geiger Counter. Jack a car, then head over to the marked Friendly Fire store. You're going to have a time limit to get through this mission.

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