To take the second part of your question first, it had always been part of the Coast Guard fleet renewal strategy that we would have two polar icebreakers. Until very recently, only one of those icebreakers was funded. I would assume, although my colleagues from the Office of the Auditor General can speak for themselves, that that is why they focused on that one—on just the one polar icebreaker.
As to why the Coast Guard requires two polar icebreakers, it's important to understand that you can't run something as big and complicated as an icebreaker for the full 12 months of the year, year in and year out. There will always be times when you need to take it in for routine maintenance and routine refit. For three months out of every 12, we would normally expect the icebreaker to essentially be in the shop, as I say, for routine maintenance and routine repair.
If you want to have year-round coverage in the Arctic—which is very much the goal to do all the things a polar icebreaker needs to do to meet supply, to assert Canadian sovereignty, for search and rescue, for Arctic science—you need to have two polar icebreakers so you can cover off those three months.
The other motivation that is quite important is that if a polar icebreaker gets into trouble in the high Arctic, it's going to need another polar icebreaker to go to its rescue. Rather than relying on another country—which might take a very long time to get to the scene of the problem—having two polar icebreakers means that if one is in trouble, the other one can go in and rescue it.