Stick a fire hose in the bunker and flood it. If he comes out great, if not who cares. It worked to get that looser john walker the so called American taliban freedom fighter out of his bunker. If it's a forest they should have some sort of firefighting capability to get water that close to a road. Heck I don't even think they'd have to flood it all the way. after a few days in knee deep water with no heat or dry feet and he'll be ready to poke his head outside.