Far beneath a national park in one of the coldest parts of Australia is where the government wants to build a hugely ambitious project: a power station capable of generating 10% of the nation's energy.

It is part of a bold - and expensive - hydro electricity scheme in the Kosciuszko National Park in south-east New South Wales.

The Snowy 2.0 project has ambitions to carve tunnels through 27km (17 miles) of rock to make a huge pipeline linking two reservoirs. The difference in elevation of 700m (2296ft) is what gives the plan its extraordinary might.

It is simple enough in concept, but elaborate in design, and challenging in practice...

"There is no question this is a big engineering challenge. Ultimately, you don't know exactly what the rocks look like between the two reservoirs," says Dr Matthew Stocks, a research fellow at the Australian National University.

Read the full BBC article.