More methamphetamine has been located following a major bust in Northland on Sunday.
Thanks to local informants and an off-duty cop in the right place at the right time, police seized 448kg of methamphetamine in Northland, the country's largest bust.
The total collected has been increased to 494kg, after a GPS device found in a car involved in a chase yesterday took police to sand dunes on 90 Mile Beach.
Digging revealed another stash of drugs.
A second boat has also been seized.
Earlier Superintendent Russell Le Prou said an off-duty cop and Northland police were "buzzing" to have stopped the massive first haul from getting onto the streets.
It had a street value of $448m.
He said the origin of the drugs was subject to a police and customs investigation.
The seizure is a record for New Zealand, eclipsing a 334kg haul made in 1995.
The huge find comes after a number of mesh bags were discovered by police in the back of a boat found abandoned on Ninety Mile Beach on Sunday.
Police launched a search for a Toyota Prado and a rental campervan.
They said that occupants of the vehicles had been seen in the area in the past two weeks, acting suspiciously and trying to launch boats.
Reports had also come in that the men driving the campervan and the Toyota had allegedly been offering large amounts of cash to locals in exchange for help launching boats off the beach.
While police went to recover the boat, the Toyota drove past. When the driver failed to stop, police started chasing.
When the driver eventually stopped at the Ahipara Golf Course, two men, aged 31 and 26, were arrested.
Police said that several hours later they saw the campervan at Totara North and stopped it. In the back were bags of methamphetamine.
The 19-year-old driver and the campervan were taken back to Kaitaia police station.
In the campervan, police said they found suitcases and bags, inside of which were dozens of zip-lock bags containing P.
Investigation into where the P came from
Police and Customs believe the drugs were retrieved from the waters off Ninety Mile Beach. Many of the bags showed signs of exposure to salt water on the outside.
The methamphetamine has since been removed from the police station. Investigations are now underway into where it came from.
The three men stopped by police were remanded in custody after appearing in the Kaitaia District Court jointly charged with importing Class A drugs and possession for supply of a class A drug.
Police appealed for anyone who may have noticed suspicious activity from anyone travelling in a Toyota Prado with a boat, or travelling with a campervan in the Far North over the past two weeks, to contact Kaitaia Police on 09 408 6500, or anonymously Crimestoppers on 0800 555 111.