Shell's Arctic drilling is delayed because a ship supposed to deal with ice and oil spills developed a large hole in its hull.

Operations in the Arctic are especially unreliable. That's acceptable for operations whose failure is not catastrophic. If the worst danger is a small chance some crew might die, as is always possible on the sea, they may consider that acceptable. But when the danger is pollution of a large area for a century or more, we must not allow them to risk it.