Major Snowy 2.0 tunnelling operation on hold after NSW government intervenes

The hole above the boring machine, pictured in February. (Supplied)

Snowy Hydro will not be able to move its stuck tunnel-boring machine (TBM) until it proves to the New South Wales environment department that doing so will not cause "further damage" to the environment in Kosciuszko National Park. 

The 143-metre-long TBM Florence ground to a halt last year, after a 9-metre-deep hole appeared on the surface above it in Kosciuszko National Park.