The truck was found completely submerged in water near Puatalefusi wharf.
According to Kaniva News, Neiafu Town Officer Vāvā Lapota said the truck was expected to tow a boat at a launching ramp near before the incident occurred.
It was unclear whether the truck was dragged into the water by the boat or it slid before it plunged into the sea.
Lapota said it was raining and the ramp was slippery.
