The Constitution III was an Earth sailing vessel, slightly bigger than a schooner, but still basically a yacht. It was plying the Pacific Ocean on Earth 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 on Salutua. It also put a three-foot hole into the hull.
A Semquess drug merged it with Nancy Norton and fragments of Brokk's eyebrain into an insane monster. It was stopped by Amelia Grover after another Semquess drug transformed her into an angelic being. (PROSE: The Eye of the Giant)