1. Clashes between the whalers and opponents have escalated in recent years, and a Sea Shepherd boat sunk after a collision with a whaling ship last January.
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2. The whalers have responded by firing water cannons and sonar devices meant to disorient the activists.
3. But the whalers could also try to have the Ady Gil charged with terrorism at sea for trying to foul its navigation systems.
4. " What was once a whalers'club has become a force for conservation, " said Chris Tuite of the International Fund for Animal Welfare.
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5. Relations between Japan and Australia were strained since environment activists and Japanese whalers clashed in the Antarctic sea in mid February.
6. Chadwick said the Japanese whalers were heading toward the Ross Sea, an area for which New Zealand has international search and rescue responsibility.
7. Watson expects to find the whalers in a week and again prevent them from harpooning whales.
8. Palmer said it inflames public opinion every time the Japanese whalers are in the Southern Ocean.
9. The Bob Barker left the Ady Gil to sink and resumed its pursuit of the Japanese whalers.
10. Video taken by the conservationists shows the whalers responding with water cannons.