I have a quick follow-up question on that. It was clear in the statements you made, Mr. Pryce, in your presentation that it was intended to shelter it from upper aquifer zones. Mr. Schwartz's presentation shows that the industry does not protect groundwater below 600 metres from chemical injection, even though we have known areas of pristine groundwater as deep as 1.5 kilometres.
So is there any concern from the industry's side about potential impact on deep aquifers?