Passover, the holiday of freedom ... And so it is: Avinatan is a beacon of light in a tunnel deep beneath the ground. If you close your eyes, you can feel his light glowing in that dark ...

Just think of Norway's Rogfast tunnel, which at 392 metres below sea level will be the longest and deepest underwater one in the world. Or, for that matter, Denmark's 11-mile Fehmarnbelt ...