The bottom of the spectacular Great Belt bridge in Denmark was almost scraped by a passing cruise liner on October 30.  The new boat, a massive mega cruiser named the “Allure of the Sea” provided extra allure when it passed below the suspended span with about a foot to spare.  In its original configuration, the ship was too tall, so special modifications like temporarily removing masts were made.  Also, apparently a boat is lower in the water when it moves faster, so the engineers revved up the engines (a similar approach was used by the Titanic, with less desirable results) so that extra clearance could be provided.   This article in CNN.com provides details.   Fortunately, it looks like things turned out well for both the ship and the bridge.