Unmanned submarines in the United States. "Good" way to spend money

The thought of creating a fleet of small, unmanned submarines in the American Navy is not fresh at all. For respective years now, it has been analyzed in the U.S. Navy usefulness of specified a solution, as well as the construction of vessels, which were always only technology demonstrators. Each time the trials were successful, with only the remark that the recommendations for starting production remained on paper.