Okay, makes sense. I'm sure they know about GPR's and such (if that is what you were referring to, is it?) but like I said, actually draining the swamp has a much better audience capturing effect. Hollywood has to put on the hype. Most viewers wouldn't sit through watching colored imaging on a computer screen, that would be boring. I know they've already used GPR technology on Oak Island. Surely they've already used it on the swamp? They probably already know what's there and the draining of the swamp is nothing more than fodder for the show. Truth be told, the producers might even be paying for it, just for that reason. JMHO
Here's a link with the review of past Geophysical Investigations on Oak Island-
http://www.oakislandtreasure.co.uk/EOID08/les.pdf