Since this is the first I'm hearing of it.. I'm wondering how long they thought they could keep it quiet?
Not that rare. You didn't hear from the near-catastrophic mishap near Australia, either. Gets all drowned out by the news about the Mexican Gulf oil leak. Nor did you ever actually get big news before when something like this happened, the reports just stop when the companies (and that's not only BP, all those people in the court hearing about the oil disaster pretending that their platforms would never crash like this were ly... err, putting things in very rosy words) get their oil disasters under control.
Did you know that there is a massive leak of natural gas in the North Sea that nobody even tried to close? You know, it's just a slight annoyance for the atmosphere that blows 300K tons of CO2 equivalent into the air each year. But there's no birds killed or beaches ruined, why close it? ^_^