The sound of exploding papa rock will be heard reverberating around the hills of the Whanganui River over the next week.
A 70m stretch of the Atene Skyline Track fell away during last year's flooding, leaving a smooth papa cliff face and work to restore it began this week.
Abseil Access have been contracted to blast a track along the cliff at Atene joining up with the existing track.
"It's just a solid papa cliff face, hence we've got the explosives guys here to blast it out," Department of Conservation recreation ranger Shane Woolley said.
He expected it to take about two weeks.