Passing through many stone buildings, across various areas, reaching the end of the city, there was unexpectedly a vertical stone wall.
Philip was somewhat surprised, unsure whether the city was originally built tightly against this stone wall, or if before construction, a mountain was half enclosed and then carved to this shape.
What surprised him even more was the huge arched hole in the stone wall, pitch-black and leading who knows where. Dense "凹" shaped metal pipes extended from the hole onto the ground, their purpose unknown.
Later, he heard from others that these "凹" shaped metal pipes were called tracks, and as for the round hole, it was called a tunnel.
Philip, with his son and the others, was hurried onto a dam-like platform adjacent to the tunnel by the officer named Norton Wanwa, and told to wait quietly.
After waiting for about ten minutes, suddenly everyone simultaneously looked towards the tunnel, having heard a strange sound.
"Crunch, crunch..."
