All seven people who took part in a Greenpeace protest at Port Taranaki, including actress Lucy Lawless, have been charged with burglary.
The seven would appear in New Plymouth District Court on Thursday, police said.
Greenpeace named the six arrested today as Lawless, Mike Buchanan, Shayne Comino and Raoni Hammer, all of Christchurch, Shai Nades, of Wellington, and Vivienne Hadlow of Auckland.
The seventh person arrested, Aucklander Ilai Amir, had left the protest on Saturday for personal reasons.
A Shell ship, the Noble Discoverer, was meant to leave Port Taranaki over the weekend on a 6000 nautical mile journey to the Chukchi Sea, off the coast of Alaska, to drill three exploratory oil wells.
However, the seven Greenpeace activists boarded it early on Friday to protest against the planned drilling.
A Greenpeace spokeswoman said the charge of unlawfully being on a ship as available to police but they had instead chosen to charge the protesters with the more serious crime of burglary.
"Greenpeace insists that no property was taken or damaged during the occupation,'' the spokeswoman said.
Lawless said before being arrested that seven may have been on the ship "but 133,000 of us came down'', referring to the organisation's online campaign, in which people sent emails to Shell executives encouraging them to stop their Arctic drilling plans.
"We will continue to stand in solidarity with the communities and species that depend on the Arctic for their very lives until Shell cancels its plans to drill in this magical world, and makes the switch to clean, sustainable energy,'' she said.
"This chapter has ended but the story of the battle to save the Arctic has just begun.''
