There are large parts of the World Ocean which are still to be discovered, so we do not have a complete picture of the state of our oceans. However, we already know that we have been doing damage to the overall oceanic eco-system by over-fishing, and by dumping not only waste, but highly toxic waste, in many hidden away areas of the sea. This episode of Futuris features disappearing fish stock, strange bacteria on underwater volcanoes, coastal changes, and endangered species amongst other issues.