Around 2012 it suddenly got to be a super popular meme on the internet again somehow, telling a long rambling story (especially in 4chan greentexts) that ended with "And right about then I noticed she wasn't no girl but instead a 500 foot crustacean from the paleolithic era. And I said GOD DAMMIT LOCH NESS MONSTER YOU TRICKED ME AGAIN! I ain't givin you no tree fiddy!"
Naturally, it continues (and continues to defy explanation for its popularity) to this day.[DOUBLEPOST=1478897853,1478897652][/DOUBLEPOST]
Dirt roads aren't that easy to make they they'd escape notice, and those smalls hills in the picture aren't naturally navigable.
Oh, and wouldn't a backpack be enough for the radioactive material that would be used for a dirty bomb, while the explosives could just be done in the US?
The needles hide in a stack of needles. There's dirt tracks all over, and really, they're not even entirely 100% necessary. Seriously, a lot of that area the sand might as well just be really dusty tarmac. Trust me, I lived much of my life in that area, there's ways through those hills, and also notice there's basically a road running alongside both sides of the border.
As for the backpack radioactives, I guess it depends on how much you want to move and how much you care if you get cancer or not.