We've heard some information that has not really been fully substantiated and that probably won't be fully substantiated until the actual BOP stack that was at fault in this case is recovered. But the understanding we have is that what occurred is not something that we would have ever been allowed to see happen here in Canada.
Mr. Bugden referred to the dual barrier system we require when all wells are being drilled. As he said, the first barrier is the drilling fluid itself, the drilling mud, which has a high specific gravity, and it's high enough to counterbalance the hydrostatic pressure of the hydrocarbon. Before that barrier is removed, ordinarily there's another barrier put in place for the cement plug--actually it's concrete, but the industry uses the term cementing--so that you seal a certain length of the well bore, perhaps as much as 30 metres or 40 metres.