"Anti-whaling activists are returning to Australia after an engine problem forced them to end this season's Antarctic campaign against Japanese whalers.
Head of the Sea Shepherd group Paul Watson said he had ordered the Bob Barker ship to stop following the Japanese and return to Tasmania.
Capt Watson said the ship had a fuel valve problem that could cause an engine breakdown.
Capt Watson labelled this season's campaign the most successful in its six year history of campaigning in the southern ocean."
Melissa Iaria reports for AAP February 26, 2010.