On Tue, 27 Apr 2010 13:37:50 -0700 (PDT), Frogwatch
wrote:

40,000 gallons of oil/day would fit into a cube 17.5 feet on a side,
not exactly a major spill. Consider that 75% of such oil is typically
volatile and will readily evaporate, that goes down to about 11 feet
on a side, a tiny amount.

except it's at a depth of 5000 feet right now. hard to evaporate from
that depth.

and it doesnt matter HOW MUCH is there. what's important is what
concentration is needed to do damage. the answer is, not much.