I will definitely start, and then perhaps I can pass it to Ms. Garrett on the details.
One thing that I think is important.... As Mr. Stanton indicated, we have constructed the first phase of the visitor welcome centre, and it may be useful to compare the estimates that we have here and the actual costs that resulted in that project.
Phase one of the visitor welcome centre, from a gross square metre perspective, so apples to apples, is approximately 5,700 square metres. If you extrapolate that to the size here, that would give you an estimate of $780 million, approximately, and that is non-escalated. If you added an escalation factor into that, that would take you above $800 million. The estimate that we have here is $730 million for that kind of apples-to-apples comparison. I think it can illustrate the comparability between something that is a completed project and the costs that were incurred against the estimate, and the estimate compares favourably to those real results.
On the excavation, in particular, we have awarded a contract, so that has moved from an estimate to a more concrete estimate, if you will. I'll ask Ms. Garrett to provide the details on that.