Abandoned Tank Forest Escape

Tourists people curious than mandatory routes, they are trying to get to where they are not welcome. This happened to one traveler, curled up with a paved trail and has lagged behind the group. He discovered in the deep woods abandoned military vehicles, tanks and armored cars, and could not resist, got into the first tank. Rusty hatch slammed shut, and the poor man was trapped. Help the hapless researcher free, look for different objects that can be useful in solving a puzzle.