RedactedNarrative: ON 07/21/2017 V1 WAS BEING TESTED ON THE LAKE NEAR SITE 5 WHEN IT BROKE DOWN. THE OPERATOR GOT V1 TO SHORE WHERE IT BEGAN TAKING ON WATER FROM PASSING  BOAT''S WAKES. V1 WAS BEING TOWED FROM SITE 5 BY A SECOND VESSEL WHEN THE TOW ROPE BROKE LOOSE. AT THIS TIME V1 TOOK ON WATER AND SANK.