Apologies - I had skimmed the sentence immediately preceding the one I quoted, although it does contradict what you'd said. They wouldn't have welcomed it melting through the ground (just melting or otherwise) for the very reasons given by yourself. There was no need for the rolling eyes smilie though. Why is everybody becoming so aggressive on this forum these days? Everybody seems to take offence at the slightest remark or be incapable of holding any kind of conversation without being prickly.