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Manawatu Herald, Volume XLIX, Issue 3779, 14 April 1928, Page 1

In the vicinity of the various volcanic cones .around .Auckland numerous underground passages have been discovered, and investigations show that these often extend for a considerable distance. In the wet season they frequently serve as watercourses, but in summer it is possible to walk along them by the light of a candle or torch. They originated during the volcanic upheavals of centuries ago as air jiockets and steam passages in the molten lava. A few days ago a system of such passages was discovered in the One Tree Hill Domain. A charge of explosives had been set off in the bottom of a well which was being sunk for a water supply for the district, and, after the smoke had cleared away, workmen were sui'pvised to find tKat the bottom had disappeared. The charge had blown through the roof at the intersection of several passages, which had a height of about 4ft. The walls and floors were damp and there were signs that water had recently been flowing along.