Oh I think the oil companies would have a pretty good idea of exactly how much oil is down there. Whether they disclose that to you or me is another matter, but don't confuse the two! They might try to hide the fact, to keep the price high, but as we can see, the oil companies are doing very nicely, and they didn't get that way by drilling where there's no oil. They will have done their own seismic exploration to assess the exploration prospects.