Science Past from the issue of June 17, 1961

LONG-RANGE SYSTEM FOR SPOTTING SUBMARINES — A sonar system for detecting and tracking enemy sub­marines long before they reach United States shores is being developed by the U.S. Navy.… The sound transmitter, or transducer, which is five stories high and weighs hundreds of tons, will be carried on a former Navy tanker, the USNS Mission Capistrano.