Deep Trouble covers the concerns of commercial fishing from a global perspective. Many species of fish that are eaten every day all around the world are now seriously threatened or are critically endangered. The Southern Bluefin Tuna for one. Mainstream awareness of where market fish come from let alone how endangered they might be is minimal. As fish stocks dry up, supermarkets are now offering new and strange species from the deep sea. Bizarre-looking creatures are being dragged up in vast fishing nets from depths of 1,000 metres or more, and the methods used to catch them are horrifying. How sustainable is this?