The search for a missing swimmer at Maruia Falls, in the Tasman District, continued today during "extremely challenging conditions", police say.
One person was pulled out of the water at Shenandoah just after midday on Friday, but another person - a man - remains missing.
Nelson Bays Area Commander Inspector Matt Scoles said police staff continued to search the area again today "in extremely challenging winter conditions, with very cold water temperatures and murky water".
Scoles said the search will continue this week.
Nelson Bays Search and Rescue staff, local Nelson surf life saving crews and local river experts will continue to search the area over the coming days, he said.
"We'd like to thank all the people who have assisted in and who will continue to assist in the search.
"Our staff and a number of volunteers are working tirelessly to be able to locate the man so we can bring him home to his family."
Scoles said police will continue to provide the man's family with any necessary support.