First, you have to be careful when you ask this question, and I'll tell you why.
HNS is not just esoteric chemical products that we don't identify with; it also includes things like oil. The HNS convention includes oil. Therefore, as soon as you get into a spill that costs more than $200 million for oil, you could say it was an HNS spill. The HNS convention itself says that it will not pay on top of the other convention. In other words, if you can get any funding out of the other convention, then you can't get funding here. They're not on top of one another. Any oil spill is an HNS spill because oil is HNS.