https://techcrunch.com/2018/11/01/reef-rejuvenating-larvalbot-spreads-coral-babies-by-the-millions/

The continuing die-off of the world’s coral reefs is a depressing reminder of the reality of climate change, but it’s also something we can actively push back on. Conservationists have a new tool to do so with LarvalBot, an underwater robot platform that may greatly accelerate efforts to re-seed old corals with healthy new polyps.

The robot has a history going back to 2015, when a prototype known as COTSbot was introduced, capable of autonomously finding and destroying the destructive crown of thorns starfish (hence the name). It has since been upgraded and revised by the team at the Queensland University of Technology, and in its hunter-killer form is known as the RangerBot.