Four Hours in a Tunnel

Four hours stuck in a tunnel, The dog wants a pee, you get to the other side eventually and no car, van or M/H. Is the Tunnel the best? With a ferry you still have the car with you even if  A. it doesn't leave, B. it turns back. C. if it sinks you can claim they were all immaculate and low mileage for the best compensation. Whatever, your holiday didn't get the best start