Standing in the vast mouth of the tunnel, overcome with awe, the Imam says to the others, "Alhamdulillah! The inside of a mountain is indeed a holy place. This reminds me, it was in a cave in a mountain where Allah revealed the holy Qu'ran to The Prophet, peace be upon him."
The Catholic priest says "Hail Mary, mother of God! Mountains are magical, mystical places. This tunnel reminds me that it was in a hole in a mountain, surrounded by rock, where Our Lord Jesus Christ's body lay for three days before he was resurrected."
The Pastor says "Quite, quite. Praise God, rock of ages. Since time immemorial a place of safety. I am reminded that The Old Testament tells us it was in caves in the mountains that the people of Israel hid from persecution by the Midianites."
Nodding sagely in religious contemplation the three await the Rabbi's comment. After a few moments of silence, they realise the Rabbi isn't with them any more. Looking around, they see him running down the tunnel, robes billowing out behind him. "Hey!" they cry out after him. "Where are you going?"
"Hallelujah! I saw the sign pointing towards Switzerland and it reminded me of where the Nazi's hid my family's gold!"