Yes it does have a tunnel starting about 3 feet from the back and is about 16" wide and peaks at about 2" at the back of the boat, if that all makes sense.

The Koffler Lite like mine is an extremely light boat that runs extremely shallow water, I've seen other boats (flat bottom to 4 degree) run shallow but 90% of the time will drag their shoe in anything less than 6" of water without the tunnel. It also comes in handy for those shallow water starts at the end of your drifts.

Keith