A New Zealand-led naval task force has made its highest value drug bust of the year, seizing $1 billion worth of drugs in the Middle East.

Among the seized drugs were one tonne of heroin, 660 kilograms of hashish and 6kg of amphetamine.

British Royal Navy frigate HMS Lancaster last week identified a suspicious sailing ship in the North Arabian Sea as part of its operations in the Combined Maritime Task Force 150 (CTF 150).

The New Zealand Defence Force said Royal Marines boarded the dhow while a Wildcat helicopter with a Royal Marine sniper team covered them.

Once the six crew were secured, the marines found 50 packages containing 1000 kilograms of heroin, 55 packages containing 660 kilograms of hashish and 6 kilograms of amphetamine tablets. The drugs were taken back to the ship for testing and disposal.

 Royal Navy frigate HMS Lancaster, part of New Zealand-led CTF 150, has seized NZ$1 billion worth of illegal drugs in the Arabian Sea. Photo/ NZDF

Lancaster Commanding Officer, Commander Chris Chew, praised his crew's motivation, commitment and dedication.

"This is another example of where Lancaster has delivered at range, in isolation, utilising her own organic assets," he said.

CTF 150's commander, Royal New Zealand Navy Commodore Rodger Ward said it was the highest value narcotics interception made since New Zealand took command of CTF 150 this year.

"Conducting maritime interdictions requires a team effort from the men and women here in the headquarters in Bahrain reaching through to those out on the oceans disrupting drug smuggling operations at the coal face," he said.

"I'd like to acknowledge the 210-strong ship's company from Lancaster for continuing to get amongst it day-after-day.

"Everyone in the team can be proud of their efforts to disrupt the criminal and terrorist organisations that continue to use illicit narcotics to fund their activities and this is a significant blow to their revenue stream."