The Police National Dive Squad has searched Mangatawai Stream, which starts on the slopes of Mount Tongariro and runs down to the Tongariro River.
Based on Saturday's search, Inspector Tony Jeurissen says further plans are being put in place.
"Unfortunately, the two men have still not been found but searchers remain determined to find them."
Small developments like finding the beanie have kept the searchers going.
"With the continued dedication from all the volunteers, we will bring these men home to their whānau," Inspector Jeurissen said.
He was grateful for the enthusiasm shown by many people all week, and for the ongoing support from Ngāti Tūwharetoa.