Circle Line Boat: X

X started out as USS LCI(L)-758, a Landing Craft Infantry (Large) commissioned on May 20, 1944. During World War II, she served in the Asiatic-Pacific theater, taking part in several campaigns including Leyte, Ormoc Bay, Mindoro, and Lingayen Gulf in the Philippines. After the war ended, she spent four months on occupation duty in China before being decommissioned in May 1946.

Sold in 1955, she was rebuilt in Mill Basin, Brooklyn, and renamed Circle Line X. Circle Line outfitted her with a variable-pitch propeller and a radar system, upgrades that made her one of the more capable boats in the fleet despite being slower and harder to maneuver than some of her newer sisters. Two of her captains once said she "became one of our favorites" anyway.

X circled Manhattan for decades, alongside occasional charters and mystery-themed cruises, and even stood in for a submarine's interior during the filming of an episode of the TV series Zero Hour. In 1994, Circle Line hosted a reunion cruise for surviving crew members who had served on the 758 during the war, some of whom didn't know the ship still existed.

X was retired from service in 2007. In 2014, she was added to the National Register of Historic Places, and Circle Line has explored turning her into a floating museum and terminal near Pier 83.