Trieste II
The Trieste II (service name: DSV-1 for Deep Submergence Vehicle 1 ; German for example: Deep Submergence Vehicle 1 ) was a US- American bathyscaphe . It was the successor to the successful Trieste , which had been bought by the US Navy in 1958 and whose pressure hull was reused. The original design was heavily modified by the Naval Electronics Laboratory, San Diego , and built in the Mare Island Naval Shipyard . After completion in 1964, the Trieste II was transported to Boston via the Panama Canal .
Under the command of Lt Comdr. John B Mooney, Jr, with co-pilot Lt. John H. Howland and Capt. Frank Andrews, conducted the Trieste II dives in the vicinity of the sunken submarine USS Thresher . In September 1964 she discovered parts of the wreckage that could be identified as parts of the thresher .
Between September 1964 and May 1966 the Trieste II was heavily modified in the Mare Island Naval Shipyard. However, it is unknown whether it was used in this new form. At the same time, a third configuration of the bathyscaphe was planned. This led to a new look for the Trieste II and included the installation of a new pressure hull.
Until September 1, 1969, the Trieste II was only listed as "equipment". It was only on this day that it was put into service as a vehicle with hull number X-1 . On June 1, 1971, she was reclassified as DSV and was in service with the Pacific Fleet until 1980.
Today the Trieste II is exhibited as a museum ship in the United States Naval Undersea Museum in Keyport ( Washington , USA ).