Rugged weather has caused further sinkholes below Dunedin's Saint Clair Beach promenade.
King tides from this week's supermoon have combined with south-westerly gales to batter the sea wall, eroding the sand and rock foundations for the second time in little over a year.
Council engineer Peter Standring said it is a rugged, harsh environment and simply mother nature.
"The integrity of the wall is still solid...it's just some of the material behind the wall has been sucked out," he said.
The eastern part of the esplanade has been cordoned off while engineers work to plug the base of the sinkhole with rocks.