The USNS Mizar (MA-48/T-AGOR-11/T-AK-272) was a versatile research and cargo vessel of the United States Navy, named after the star Mizar. Built by Avondale Marine Ways, Inc. beginning in January 1957, she was constructed on a Maritime Administration type (C1-ME2-13a) hull, featuring ice-strengthened, double hull design suitable for polar and deep-sea operations. The ship entered service on March 7, 1958, primarily supporting the Military Sea Transportation Service (MSTS) with operations around Canada and Greenland, and making a notable voyage to Antarctica in 1961. In 1964, Mizar was reclassified as AGOR-11, emphasizing her role in deep oceanographic research and search operations. She was fitted with a specialized well—measuring approximately 23 feet long and 10 feet wide with curved ends—to facilitate the handling of heavy scientific and underwater equipment. This center well was a significant modification, enabling the ship to deploy and retrieve deep-sea vehicles with substantial payloads, including the use of a deep-sea “fish” equipped with cameras, sonar, and magnetometers for ocean floor studies. Throughout her service, Mizar supported extensive acoustical and oceanographic research, including operations in the Greenland, Norwegian, and Barents Seas, notably participating in the acoustic propagation and noise experiments of Operation NORLANT. Her sophisticated acoustic navigation system, an early short baseline system, allowed precise positioning of towed vehicles relative to the ship and seabed, crucial for deep-sea exploration and wreck searches. Mizar played a key role in locating the wreck of USS Thresher in 1974, demonstrating her effectiveness in submarine search operations. Over her career, she supported environmental monitoring, water sampling, and underwater photography, including monitoring scuttled vessels laden with nerve agents. In the mid-1970s, Mizar transitioned to support the Navy’s Project Caesar, focusing on anti-submarine warfare systems, and was operated under the Naval Electronic Systems Command. She was decommissioned and entered the James River Reserve Fleet in December 1989. Ultimately, her dismantling and recycling were completed in 2005, marking the end of her distinguished service.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.