This photograph is taken just inside the upstream portal of tunnel 1. It clearly shows the typical (a) flat floor (b) cut and convex shaped limestone blocks lining the first few metres of (each) tunnel until the rock is stable (c) the transition to the basalt which is the core native rock of most of the hills the tunnels traverse. There is light at the end of this tunnel which is just 137 metres long.
The workmanship in these little tunnels is first rate - you are looking at an 130 year old tunnel here!
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Photo taken in Pukeuri, New Zealand
Misplaced? Suggest new location