Who wants to get in a fight with Xena the Warrior Princess?

It seems that a major oil corporation doesn't have much of a choice. On Thursday Lucy Lawless, the actress who played Xena, and six other Greenpeace activists illegally boarded a drilling ship leased to Shell Oil off New Zealand's western shore. The group reached a 174-foot drilling tower and held a sign "Stop Shell #SaveTheArctic."

CNN spoke with Lawless on the Noble Discoverer Friday morning, the middle of the night in New Zealand. It was cold and noisy and she wasn't getting much sleep. But the actress didn't seem bothered at all. Asked to describe how she and the other protesters got on board, she said, "We walked like human beings wearing hard hats (but) I don't want to give away any trade secrets."

Greenpeace, in a statement, said the group had actually scaled the drillship which was in the Port of Taranaki in New Zealand. The activists were told to get off. But Lawless and the protesters refused to cooperate.

"We thanked them for adhering to their protocol," Lawless said, stressing that the exchange between the activists and authorities has been peaceful. "We know we'll be arrested. We have no choice but to stay where we are and send our message to the world."

Lawless said the activists are prepared to hunker down until their anti-Arctic drilling point is made. By early Friday afternoon it appeared that it was - stories were popping up across the Web and in news outlets across the globe about the stunt.

"We feel very much that what happens in the Arctic doesn't stay in the Arctic anymore," Lawless said. "An oil spill can never be cleaned up because of the remoteness and the freezing temperatures. We risk trashing whole ecosystems and poisoning them from plankton on up. It's absolutely unthinkable."

The Noble Discoverer is owned by Noble Corporation and is contracted for operation by Shell, according to Shell spokeswoman Kelly op de Weegh.

Lawless and the other activists have "occupied" the drillship to prevent it from departing on a "6,000 nautical mile journey from New Zealand to the remote Arctic to start an exploratory oil drilling program that threatens to devastate the Alaskan coastline," Greenpeace spokeswoman Szabina Mozes said.

"We are disappointed that Greenpeace has chosen this method to protest," op de Weegh wrote in an e-mail to CNN. "Actions such as this jeopardize the safety of everyone involved. While we respect the right of individuals to express their point of view, the priority should be the safety of Noble's personnel and that of the protestors."

Shell is investigating how the activists got on board, op de Weegh wrote.

Lawless, a longtime environmental activist, has never done any protesting as extreme as this. She said she thought about her three children and her family when deciding whether to participate in the Noble Discoverer demonstration.

"The oil that is captured will be burnt in the air to rain more destruction down on our grand children," she said.

Lawless has no idea how many days she and the group will be out to sea. She brought some chocolate and peanuts with her.

"We're here as long as it takes," she said.