There has been no other accidental or continue small scale discharges from the thousansds of rigs in the Gulf alone?BP supposedly had calculated the risk of a catastrophic event like that Challenger Deep well kicking and causing an explosion. They said it was practically non-existent. You can put double hulls, use pilot ships, but what is the insurance for that catastrophic event that they say is so unlikely? The payout from Exxon Valdez was lowered by the courts, worked out to about $15,000 per fisherman. Some of those fishermen could make that much money in a very good day or in a below average week before the accident.
Ever seen a drilling operation that doesn't discharge into the environment? 1000 offshore rigs losing 10 barells a day for over 50 years adds up.
They didn't make that kind of cabbage per day in the 80's.