"water flowing underground"

Lost Crusaders' Tunnels Found Near Palace on Malta

I've still got this fascination with European history. Malta is one of these micronations whose existence I've found interesting recently. I read about Malta this past fall, in a magazine I picked up during my travels. The article was regarding expats who had relocated to live on various islands, and the associated costs. For a little while, I contemplated what would be involved with relocating to Malta, should the world economy worsen further, because the costs were cheap. I couldn't quite figure out what I would do for a living in Malta, though.

Anyways, the leading lines from the article from National Geographic, on tunnels unearthed underneath Malta's major city:

For centuries it's been said that the crusading Knights of Malta constructed an underground city on the Mediterranean island of Malta, sparking rumors of secret carriageways and military labyrinths.

Now a tunnel network has been uncovered beneath the historic heart of the Maltese capital of Valletta, researchers say. But the tunnels—likely from an ahead-of-its-time water system—may render previous theories all wet.

Enjoy!