The settlement was in danger of slipping away because of water coming down the Waiau River and the encroaching sea.
A state of emergency was called earlier this month and has been extended since then.
Southland District Mayor Rob Scott extended the state of emergency yesterday through to Monday.
Work was paused on Sunday because of tidal and weather issues but it would restart today.
The best estimate was about 30,000cu m of material would have to be removed to cut through the bar and let the water flow to the sea.
The threat to the Bluecliffs community had not diminished and work continued on both finding ways to clear a tip site and opening the mouth of the Waiau River.
The bar opening would hopefully reduce the erosion in front of the properties and the tip for a time, which would enable further discussion with the community about the future of the area.
"It is a highly complex and changing environment, and it’s unknown how well this opening may work or how much time this might provide the residents," Mr Scott said.
Public access to the boat ramp and some roads in the area would be restricted.
"We’ve had reports of people visiting the area to have a look.
"Please avoid any unnecessary travel to the area while this state of emergency is in place.
"This is for the safety of residents and those working in the area."
