The tunnel to the left winds around like a spiral, passing several more tunnels. You turn down one of them, then climb steeply. In a few moments you climb through a hole and emerge in a desert. The weather is extremely hot – certainly over 100 degrees, but the sun is just about to set, so it should be getting cooler. In the distance is a range of mountains, which look extremely high, yet are bare of snow. 

You have no idea whether you are in the past, the future, or the present. Then you see something that fascinates and disturbs you. The sand seems to be fused into yellowish glass as if heated in a furnace. As you examine the sand more closely, you feel the air getting even hotter. Suddenly you realize the sun is not setting, but rising! 

The noontime temperature must be more than life can stand. As the sun rises higher, you feel a blistering wave of heat. The light is almost blinding. Could it be that you are witnessing the end of the world?