Manganese nodules do look like carbonized cauliflower and are supposed to be the new source of iron for our technologised society. But them lying on the floor of the pacific, approximately four kilometers deep, poses a big problem.
Jonathan joins an expedition to recruit a new Blue World camera operator in the form of a 1,000 pound Tiger shark! Working with experienced shark handlers, he puts a camera on the dorsal fin of the shark to see what it can film all by itself. But will Jonathan get his camera back? Next, he joins an experienced cave diver to explore a famous underwater cave in Northern Florida (USA).
