I apologize, but I would like to add something to Ms. Campbell's comments about technology.
When you look around the world at submarine technology and the advances in air-independent propulsion in fuel cells, there is a lot happening in this area which in the future could be used, if not under ice, certainly at ice edge and in other things like that.
These are the sorts of things we try to stay abreast of. What the intentions are, I'm not sure, but it's having quite a dramatic impact on non-nuclear-powered submarines.