SYDNEY — A space-age powerboat sent to harass Japanese whalers was rammed and sliced in two in its very first clash on Wednesday, activists said, dramatically escalating hostilities in icy Antarctic seas. The futuristic Ady Gil trimaran, which holds the round-the-world record and was enlisted by militant activists from the Sea Shepherd Conservation Society for this whaling season, received "catastrophic damage" and was sinking, they said. All six crew, who earlier hurled stink bombs at the whalers to disrupt their annual hunt, were rescued unharmed by Sea Shepherd's Bob Barker ship. Activists described the attack as unprovoked and said it...