One day you driving your ship to check your soldiers out, they are living very far away form your house. Usually you give some missions and orders to them everytime you leaving. But you would not know that if they follow your order or not. You do not like them, they do not like you, either. So they set a tunnel for you, you must drive your ship very carefully, cause if your ship touch the tunnel bar, otherwise your ship would be destroyed by their plan, and you probably gonna die. Be careful!