EcoSub

The ecoSUBμ is a small scale autonomous underwater vehicle developed by the UK's Naval Oceanography Center, Planet Ocean and ASV Ltd.  The vehicle was unveiled at the Marine Autonomous and Technology Annual Showcase this November and funded by Innovate UK to develop a launch and recovery system for multiple AUVs from Unmanned Surface Vessels.  A full product launch will be at Ocean Business in April 2017.

A press release notes that "a ‘shoal’ of microsubs can work together to collectively create a far superior 3D map of the underwater environment than a lone AUV. They can survey a large area very quickly, covering hundreds of kilometres. Paired with complementary technologies, such as autonomous surface vehicles and satellites, a more complete picture of the oceanic environment can be constructed."