JAPAN has asked Australia to prevent the Sea Shepherd ship Steve Irwin leaving port to harass its whalers in the Antarctic next summer, but the plea may have little effect.

The anti-whaling activists plan to upgrade their fleet from an ageing, former North Atlantic fisheries patrol boat to include another ship - something out of the future. The global speedboat Earthrace would head south under Sea Shepherd colours next summer, the group's leader Paul Watson said.

"It looks like a spaceship. It can do 40 knots and dive under waves completely. We'll be using it to intercept and block harpoons."

In 61 days last year Earthrace circled the globe fuelled by biodiesel. The New Zealand owner/skipper, Pete Bethune, said he decided to become involved because "this is happening in my backyard and it really pisses me off. I'm going to make a stand."

He said he was adding half a tonne of Kevlar to the vessel to toughen it against the ice. It had the endurance to go half way round the world on a tank of fuel.

"They won't get away from me," he said.

Earthrace's role was unveiled as the International Whaling Commission heard that Sea Shepherd's protests endangered the lives of whalers in the Southern Ocean last summer when the Steve Irwin was involved in two collisions.

"These are highly dangerous, and it can only be described as a miracle that there has been no death or large-scale accident to date," said a Japanese delegation member, Jun Yamashita.

"We cannot tolerate such audacity," Mr Yamashita told the commission. "We ask for

all appropriate measures, including a ban on the ship from leaving port, so that we can prevent these acts from being repeated."

Mr Watson, who is not permitted inside the meeting, said the Steve Irwin was soon to leave Brisbane for Hobart after a $500,000 refit. Its buckled hull plates had been repaired, and it was fitted with a powerful water cannon on the bow to match the whalers'.

He dubbed next summer's campaign Operation Waltzing Matilda and has adopted a symbol with a kangaroo wearing a pirate's eye patch.

An official from the Department of Foreign Affairs and Trade, David Dutton, told the 71-nation meeting in Madeira that the Rudd Government was deeply concerned about clashes in the Southern Ocean.

Australian Federal Police were conducting an official investigation, so no further comment could be made because it was possible the case would come before a court, he said.

Mr Watson said the federal police had returned videotapes taken from the ship in a raid in Hobart in February but still held the ship's log book. He said he had not been contacted recently by the federal police or Dutch authorities, under whose flag Steve Irwin sails.

The Dutch Government said it had warned the group about being involved in dangerous activities.

"The Government of the Netherlands is now preparing measures that will be announced in the short term," said Dutch IWC commissioner, Marie-Josee Jenniskens.

New Zealand's commissioner, Sir Geoffrey Palmer, told the meeting: "I think it needs to be said that whaling in the Antarctic will continue to be a magnet for protest that will not go away."

Source: The Sydney Morning Herald