The 2017 Bluedot weekend took place on 7, 8 and 9 July, Jodrell Bank Observatory, in Cheshire. Helen wwas at 'Mission Control', talking about our planet's ocean. This gigantic and dynamic water reservoir has a huge effect on our everyday life. Our weather and climate depend on it, and the battles, trade and food supplies influenced by it have shaped our civilisation. We looked at how this engine works, how different cultures relate to it, and what the future holds for the blue of our planet.