Echo Voyager is a 51 foot submarine from Boeing that can operate autonomously. A hybrid rechargeable power system allows for it to stay at sea for months at a time.
Echo Voyager can also surface periodically to relay data and information. What really makes this submarine unique is that it can be launched and recovered without the need for a support vessel, saving money and time.
Boeing has been building underwater vehicles for many years and already offers the Echo Seeker and the Echo Ranger.