As of 2009, four versions of the ROV have been designed. The original version was named the Sea Eagle, and was a militarised variant of the civilian Sea Owl ROV. This unit was long, wide, and high, could travel at , and dive to . These ROVs saw service with the Swedish Navy from 1984 onwards. The second version, named the Double Eagle, is larger, measuring in length, in width, and in height. The ROV weighs , can dive to , and travel at .