Taniwha Cave Tubing in New Zealand is just one of the delightfully crazy activities offered by Greymouth's Wild West Adventures.
Taniwha Cave Tubing in New Zealand is just one of the delightfully crazy activities offered by Greymouth's Wild West Adventures. Contributed

Taking the tube in New Zealand

I'M lying comfortably on my back, gently drifting down a river the colour of Earl Grey tea, through a magnificent green forest, watching the stars twinkle up above.

Sounds romantic ... and it was in a way ... but what I was lying on was the tube of a truck tyre, the river was running under the forest in a tunnel dug by rapacious goldminers, the water was icy cold and the stars were, in fact, glow worms on the tunnel roof.

Welcome to one of the delightfully crazy activities offered by Greymouth's Wild West Adventures.

This particular outing, Taniwha Cave Tubing, embraces much of what makes the New Zealand West Coast so special, with its combination of wild rivers, unspoiled forest, turbulent mining history ... and an adventurous spirit.

Early in the morning we had been kitted up in wetsuits - mine with a hole cunningly concealed under the right armpit - crash helmets and headlamps before being driven up the Grey Valley to the old gold mining area of Nelson Creek.

Before we started, Paul Schramm, the boss of Wild West Adventures, wanted to show me one of his ideas for making this particular adventure even wilder: a massive flying fox running from a clifftop through the trees and over the water to the launch point for the tubing trip.

It looked fantastic but, sadly, while the flying fox had been tested with weights it hadn't been approved for use by humans, so we had to walk through the bush and up the creek before hopping aboard our vessels.

Piloting a tube down a winding, shingly South Island river takes a special set of skills involving using your hands to steer, keeping your feet poised to fend off the mossy stone cliffs and being ever-ready to lift your backside out of danger should you happen to sail over the top of a large boulder.

I can't say I proved skilled at this - several times I ended up bumping through the shallows - but unlike the big Aussie guy I didn't fall off my tube after surging through one of the rapids, and unlike the the young miner from Chile, I didn't get stuck on top of a rock and have to get up and walk.

Most of the time it was quite tranquil, allowing me to lie back and muse on how different it all must have been here back in 1870, when dozens of miners were busy digging and sluicing in this very area in pursuit of gold.

But this daydreaming was interrupted when we came to the end of our river ride and moved on to the blackwater part of the outing: tubing down an 840m long tunnel the miners dug around 1910 to get water for sluicing.

Getting into the tunnel is already pretty stimulating because it involves zooming at high speed on a natural rock slide down the bank. But Paul has plans to make it even more exciting by offering a sort of controlled bungee jump down a 22m-high ventilation shaft into the tunnel.

That particular scheme is still in the planning stages but Paul was able to show me the top of the shaft, looking like a narrow gateway into a black nothingness, and pictures of the gadget that will make the jump possible, a Powerfan, which apparently lets you drop at near free-fall speed, before slowing up in time to land gently.

It sounded like fun, but I'm not sure it would compare in shock value with the slide experience, which saw me hurtle below the surface of the ice cold water flowing from under the earth, literally taking my breath away.

Once we were breathing normally again we squelched our way a couple of hundred metres up the tunnel to the bottom of the ventilation shaft, took to our tyres and drifted gently back to the entrance, taking the opportunity to lie back and watch the glow worms twinkling on the roof.

After that there was one final piece of madness. Those who wished had the chance to step off a cliff, holding their tyres to their butts, and try to land on them on the river below. The big Aussie guy suddenly had back problems. The Asians were definitely not interested. So that was just me and the Chilean miner.

I stepped off first, soared elegantly down and landed right on the tube, which sprang back from the water hard enough to throw me off. I don't know how the Chilean did. I was too busy getting the water out of my eyes, nose and mouth to be able to see.

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