The USS Harder (SS-568) was a Tang-class submarine constructed by the Electric Boat Company in Groton, Connecticut, with her keel laid on June 30, 1950. Launched on December 3, 1951, and commissioned on August 19, 1952, she represented a significant advancement in submarine design, featuring an 18-foot hull extension added during a comprehensive overhaul in the early 1960s to accommodate the innovative PUFFS passive sonar system. Harder’s early operations included a notable 1,000-mile submerged passage from New London, Rhode Island, to Nassau, Bahamas, demonstrating her capabilities in snorkeling and testing. She initially conducted fleet exercises out of New London before embarking on a challenging voyage to the British Isles. During this trip, she suffered mechanical failures with her experimental Fairbanks type 3 engines, which ultimately broke down off Ireland in August 1953. The vessel was towed back to New London by USS Tringa over a record 2,100-mile Atlantic crossing. Throughout the 1950s and early 1960s, Harder participated in a variety of NATO and Atlantic Fleet operations, including sonar evaluations, antisubmarine warfare (ASW) exercises, and submerged attack simulations. A notable achievement was her participation in SUBICEX in March 1959, where she cruised 280 miles beneath ice packs off Newfoundland—more than any other conventionally powered submarine at the time. Her service included deployments to Europe and the Mediterranean, supporting ASW operations with allied navies, notably the German Navy, and participating in peacekeeping and tactical exercises. After extensive testing of ASW systems like the ASROC, she underwent a thorough overhaul in 1962-1963, during which she was modernized with new systems and structural enhancements. Decommissioned on January 31, 1974, and struck from the Naval Vessel Register shortly thereafter, the USS Harder was sold to Italy and renamed Romeo Romei, serving the Italian Navy until her decommissioning and scrapping in 1988. Her service record underscores her role in Cold War submarine tactics and technological development.

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