An onlooker to a boat fire in the Bay of Islands says the launch was engulfed in flames within minutes.
Emergency services were called to the blaze just off Moturua Island at about 1pm on Boxing Day.
Fire and Emergency says no one was on board at the time.
Lewis Hudson was on a boat nearby, and said he could see thick black smoke pouring out.
"Really kind of intense fire, real kind of inferno. We were initially about 30 or 40 metres away and on a reasonably breezy day you could just hear the fire going."
He said a boat tour agency, R Tucker Thompson, took him sailing and the crew helped to fight the fire along with other boats in the area.
Hudson said although people tried to help, the blaze was too big.
The 19-year-old disappeared without her wallet or mobile phone.