If you drive, you'd at least be able to either get more stuff across or have a larger and more complex area for them to search. It's like trying to find someone lost in a closet ( walking), or someone lost in the forest (car). Little hidden places on cars can carry a lot of juice. You could get a windsheild wiper fluid container from a car in a junk yard, paint the inside blue, then when you get down there, put some ice packs and juice in it. Or you could have a cooler in the back with some peanut butter, jelly, and bread, and stuf some amps in the peanut butter. I guess you'd be a peanut butter packer then. Ha Ha. Just be sure to put it in something that can't be squeezed or seen through. Good luck.
BH