The Sea Shepherd conservation group ship 'Bob Barker' has collided with the Japanese whaling fleet harpoon vessel 'Yushin Maru No. 2' as the harpooners attempted to block them in a recent skirmish lasting about 6 hours in southern Antarctic waters. The incident, say Sea Shepherd, is an attempt to deter the protest ships from their current position, blocking the slipway of the Nisshin Maru, in order to prevent them from loading whales poached from the Southern Ocean Whale Sanctuary.