A water leak continues to delay the construction of Perth's $1.8 billion airport tunnel, with a sinkhole causing road closures.

The sacking of the ABC managing director Michelle Guthrie has brought her often challenging, sometimes tumultuous, two-year tenure at the top of the national broadcaster to an end.

It's one of the most popular walks in northern NSW, but rescuers are warning tourists of the increasing danger of climbing Mount Warning.

Massive commissions encouraged unscrupulous tactics, according to an ex-employee of Freedom Insurance, which came under fire at the banking royal commission.

The CSIRO says Australian industry needs to step up and get involved in NASA's plans for human bases on the Moon.