Official U.S. Navy file photo of a Bluefin-21. The U.S. Navy has deployed unmanned underwater vehicles (UUV) to join in the search for the Argentine navy's submarine, A.R.A. San Juan, in South Atlantic waters. The equipment consists of one Bluefin 12D (Deep) UUV and three Iver 580 UUVs, which are operated by the U.S. Navy's recently-established Unmanned Undersea Vehicle Squadron 1, based in Pearl Harbor, Hawaii.