BP unveils fifth strategy to plug Gulf of Mexico oil leak - Business News, Business - The Independent
i googled "why hasnt BP tried to block oil leak" and came up with a zillion articles re. BP's efforts to block/plug the oil leak.
the one above i read, it covers the steps and attempts BP has taken so far. its from england and glosses over things but im sure an inquiring mind could read more detailed articles re. their efforts to plug the hole.
So,the idea that BP hasnt tried to plug or block the hole is far from the truth it seems.