330-PSA-309-64 (USN 1105521): Wreck of USS Thresher (SSN-593).  "Draft markings on the topside rudder of Thresher. Part of the port stern plane of the sunken sub can be seen in the foreground. The bit of line on the right is connected to the underwater camera-magnetometer sled towed by USNS Mizar."  Master caption:  Despite the tragic loss, Thresher afforded the Navy an opportunity to evaluate advanced equipment and improve techniques of deep water search and inspection.  Photographs were taken at a depth of more than 8,000 feet with an improved underwater camera-magnetometer device towed by USNS Mizar (T-AGOR-11) and operated from the surface by personnel of the U.S. Naval Research Laboratory.  Visual inspections were conducted and photographs were taken by men aboard the Navy’s remodeled bathyscaph Trieste II.  Also at NHHC as NH 97558.  (2015/11/03).
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