Police and the NZ Defence Force have named the soldier who went missing in a lake near Waiouru.
Private Michael Victor Ross, 29, from Kaitaia, has not been seen since he fell overboard from an inflatable boat while returning from a training exercise at Lake Moawhango about 5.40pm on Tuesday.
Ruapehu Area Commander Inspector Steve Mastrovich said police and NZDF are doing everything possible to find Private Ross and return him to his family.
"Sadly there is little chance of finding him alive given the length of time he has been missing and our focus now is the recovery operation."
Private Ross is a rifleman with 1 Royal New Zealand Infantry Regiment (1RNZIR) based at Linton.