Lake Pupuke, in Takapuna, Auckland.
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Ancient Lake Pupuke is a popular suburban playground on Auckland's North Shore, but for a few specialist scientists it is like a crime scene and they are the detectives, trying to find a fingerprint from the remarkable rocks deep below the surface.
The site is one of many scientists are focussed on in their search for natural hydrogen that could one day help power the local neighbourhoods and provide a home-grown solution to our dependence on imported energy.
With the fuel crisis, soaring electricity prices and critical shortages of natural gas cutting deeper by the day, exploration and testing of the gas have stepped up.
