Echo Voyager Echo Voyager, Boeing’s latest unmanned undersea vehicle, or UUV, can operate autonomously for months at a time thanks to a hybrid rechargeable power system and modular payload bay. The 51-foot-long vehicle is the latest innovation in Boeing’s UUV family, joining the 32-foot Echo Seeker and the 18-foot Echo Ranger. Courtesy photo SHARE IMAGE: Download Image: Full Size (0.12 MB) Photo By: Courtesy photo VIRIN: 160310-O-ZZ999-999.JPG Photo Gallery