The oil giant Shell is on its way to the Arctic, but not before a final showdown with environmental activists in kayaks. On Tuesday, dozens of "kayaktivists" were arrested after paddling up to a Shell drilling rig and preventing it from leaving the Port of Seattle. Several dozen supporters lined up behind them. The activists set off at 4 a.m. after learning of Shell’s plans to leave later that morning. Following a brief standoff, Shell’s Polar Pioneer was able to depart after the Coast Guard pulled the activists from the water. Monday’s action marked the latest in a series of protests since Shell arrived in Seattle last month. Shell is stationing its vessels in the Puget Sound while it drills for oil in pristine and highly remote waters in the Chukchi Sea off the coast of Alaska. Environmentalists warn Arctic drilling will threaten wildlife and worsen climate change. The Obama administration has tentatively approved Shell’s plans to begin oil extraction off the Alaskan coast this summer. We are joined by John Hocevar, oceans campaign director of Greenpeace. He was one of the activists, or "kayaktivists," detained by the Coast Guard during Monday’s action against Shell oil drilling in the Arctic.