In Māori mythology Maui fished up the North Island from the sea; here the fisherman plunging into the depths is a giant drill ship, Discoverer II. By the 1960s technological changes had made it possible to prospect for oil in shallow offshore waters. This NFU film documents the months-long process of exploring for oil and gas, and the discovery of the underwater dome off the Taranaki coast that came to be known as the Maui gas field — one of the largest in the world in 1969. The field was subsequently exploited and was mostly depleted by the early 2000s.