The deep sea is a frequently used example of common access resources that is over-exploited – a case of ‘The Tragedy of the Commons’ originally coined by ecologist, Garrett Hardin. It stems from a simple idea that the benefits of over-fishing (increased revenues) are private while the costs are shared. Unfortunately, such an approach is unsustainable as a result of over-consumption and subsequent market failure. Technology is both a cause of the problem and a solution too. Larger trawlers increase catch size reducing the number left to breed. However, new technology can help to monitor, collect information and enforce regulation. One extreme proposal is to ban fishing in set zones, this has been effective in some trials allowing fish to ‘restock’ and improve sustainability. Clearly, an international agreement is required, but this is hard, especially given the current rise in nationalism and self-interest. The WTO are working on something, but have been doing so for several years.