vessels helped transport victims of the September 11 attacks in the maritime evacuation following them. Many were brought to what has since become the site of Hudson Riverfront 9/11 Memorial in Weehawken, New Jersey. After US Airways Flight 1549 was forced to land in the Hudson River in 2009, Circle Line Sightseeing vessels were among the first to respond. Fleet Currently, Circle Line Sightseeing operates 8 vessels with an additional two under construction, including: Sightseer XII - commissioned in 1933 as the United States Coast Guard patrol boat Argo, sold in 1955 and later acquired by Circle Line. Circle Line XVI - commissioned in 1934 as the USCG patrol boat Nike, decommissioned in 1964 and sold to Circle Line in 1966. Circle Line XVII - commissioned in 1934 as the USCG patrol boat Triton, decommissioned in 1967 and sold to Circle Line in 1973. Circle Line Manhattan - purpose-built in 2008 to replace Circle Line XI. Circle Line Brooklyn - purpose-built in 2009. Circle Line Queens - purpose-built in 2009. The Beast - speedboat that entered service with Circle Line in 2011. Circle Line Bronx - built by Gladding-Hearn Shipbuilding and delivered in January 2017. Circle Line Staten Island - built by Gladding-Hearn Shipbuilding and delivered in May 2017. Circle Line Liberty - built by Gladding-Hearn Shipbuilding and delivered in March 2018. The Bronx, Staten Island, and Liberty constitute Circle Line's new Empire-class boats, which claim to be state-of-the-art, and include modern amenities like digital screens and improved sound systems. Additionally, while she has been retired from service, the Circle Line X is retained by Circle Line. Circle Line X was originally built for the US Navy in 1944 as a Landing Craft Infantry (Large), designated USS LCI(L)-758. 758 participated in several landings during the Pacific Theater of World War II, including those during the battles of Leyte, Ormoc Bay, Mindoro, and Lingayen Gulf. 758 was decommissioned in 1946 and sold to Circle Line, who converted her into a tourist vessel and renamed her Circle Line X. She served in this role until her retirement in 2007, and as of 2015 Circle Line plans to turn her into a floating museum and terminal alongside Pier 83. Today Circle Line Sightseeing continues to operate on the Hudson River and is dedicated exclusively to sightseeing. Cruise types Full Island Cruise - navigates the entire island of Manhattan. Semi Circle Cruise - goes