I am working on an underwater recording studio. We are building a "3D Telescope" underwater to listen to the ocean. 28 hydrophones mounted on five 5 meter beams connected like a starfish. It will then compress the data and telemeter it home real time.

https://www.whoi.edu/press-room/news-release/whoi-awarded-1-...

Additionally I just won a grant at work to begin designing and building an open source underwater glider. Underwater gliders are one of the best ways of carrying instruments to sample the ocean. They can last 6+ months and be directed to interesting area's. The billion dollar companies that make and sell underwater gliders are focused on oil+gas+military business and are not giving the service, support or product depth the science community needs. They are in dire need of a tech refresh - they fail a lot for an old technology and run DOS. The only way we have a chance of understanding the ocean is to make sampling the ocean more affordable, reliable and accessible.