Oil is a toxic substance, but man knows how to clean up a traditional oil spill. The Deepwater Horizon is anything but a traditional oil spill. In fact, this deepwater disaster may rival some of man's worst disasters of all-time if it has not already reached that point. And it's not necessary the oil that is the problem. The methane gas bubble sitting under the Mississippi Canyon 252 might cause more devastation than the oil when it is all said and done.
Source: Helium
With the emerging evidence of fissures, the quiet fear now is the methane bubble rupturing the seabed and exploding into the Gulf waters. If the bubble escapes, every ship, drilling rig and structure within the region of the bubble will instantaneously sink. All the workers, engineers, Coast Guard personnel and marine biologists measuring the oil plumes' advance will instantly perish.
As horrible as that is, what would follow is an event so potentially horrific that it equals in its fury the Indonesian tsunami that killed more than 600,000, or the destruction of Pompeii by Mt. Vesuvius.
Source: Helium