Keywords: SSN-593 Tresher.jpg en USS Tresher SSN-593 underway on the surface Naval Historical Center - US Navy US Navy unknown Picture is in the public domain http //www history navy mil/warning html Picture shown here http //www history navy mil/photos/images/h82000/h82320 jpg PD-USGov-Military-Navy USS Thresher SSN-593 Submarines in motion |