Here is a kickstarter campaign, for cleaning hulls of ships underwater. The robot can clean about 1.5 meter square per minute. The project can be viewed here:

https://www.kickstarter.com/projects/632307707/the-first-underwater-drone-for-the-care-of-your-hu?ref=user_menu

https://www.kickstarter.com/projects/632307707/the-first-underwater-drone-for-the-care-of-your-hu?ref=user_menu

Robotic Magazine’s note for Kickstarter campaigns: Publishing a campaign here does not mean Robotic Magazine endorses or verifies the project. We publish at the request of project creators. Please check the project website for more info about the project.