Reason 2 to object to the tunnel: You don't dump in paradise.

The tunnel would be a mining project in paradise. The mining would involve noisy and polluting vehicles and machinery over many years. It would create more than a quarter of a million cubic metres of spoil, running the risk of leaching nasty chemicals into the pristine Hollyford River.

Due to the loose geological structure of the land, the mining could result in land slips around the tunnel entrance, resulting in destruction of valuable native trees and bush and their bird habitats.