Three victims of a helicopter crash, in the New South Wales Hunter region, have been remembered as staunch environmentalists.

Richard Green, his wife Carolyn and their friend John Davis were travelling from Breeza, south-west of Tamworth, to Sydney on Saturday night, but did not arrive home.

No mayday calls or emergency beacons were detected on Saturday, when severe storms hit the Hunter region.

The wreckage of their helicopter was found on Monday night in the Watagans National Park, south of Cessnock.

A paramedic from one of 10 rescue helicopters involved in the search was winched down and confirmed the wreckage was that of the missing Eurocopter and there were no survivors.

Three investigators from the Australian Transport Safety Bureau will travel to the site today.

NSW Greens MP Jeremy Buckingham spoke of the deaths during a radio interview this morning, saying “it’s a dark day for Australia”.

The group had travelled to Breeza to attend a protest against the Shenhua Coal mine on the Liverpool Plains.

Mr and Mrs Green spent hours on their beloved EC135 helicopter, travelling to remote areas throughout Australia to capture the country’s landscape.