Just follow the instructions in the video. All credit goes to the creator of the video.
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It's garbage compared to the real loot cave. You would be just as well to walk around and shoot the respawns in the area for 30mins. There are much better spots than this still in the game. And this cave doesn't work with multiple players -blam!-ing around it stops the respawns. I too a trip up their earlier to find a couple of fools not knowing how to do it -blam!-ing it up.