Our fate is inextricably linked to the fate of the oceans. Technological innovation on land has helped us immeasurably to clean up polluting industries, promote sustainable economic growth, and intelligently watch over changes in terrestrial ecosystems. We now need ocean tech to do the same under the sea. As the marine industrial revolution advances, we will need to lean heavily on innovation, ingenuity and disruptive tech to successfully take more from the ocean while simultaneously damaging them less.