Constitution III

The  was an Earth sailing vessel, slightly bigger than a schooner], but still basically a yacht.  It was plying the [[Pacific in the 1930s with passengers from Paragon Studios when it attempted a very narrow reef passage and was struck by an unidentified object.  This forced it out of its narrow clearance channel, and caused the ship to run aground.  It also put a three-foot hole into the hull.  (MA: The Eye of the Giant)