The end of the nightmare in the Gulf of Mexico may be close. BP wants to believe in all cases: two days after the start of the crucial test of strength of the new funnel, no sign of leakage was observed. "We have no indication that oil or gas escape" of damaged wells, said the vice-chair of Kent Well. Tested since Thursday, the giant funnel that contains the daily flow pouring millions of gallons of toxic liquid into the ocean, seems to hold good.

Uncertainty remains high: the compressed oil, trapped in the wells blocked by the funnel, eventually creating gaps and spread back into the ocean.According to Thad Allen, head of operations against the oil spill administration, BP must conduct further tests because the measured pressure does not allow to draw definitive conclusions about what is happening inside the well.

High pressure would suggest that well resistance is good and there is no leakage. Low pressure instead leave thinking that oil escaping elsewhere. Admiral Allen said that the pressure increased from 0.1 to 0.6 bar per hour, which was a good sign. But Friday, the level of pressure in the well still left casts "doubt on the possible existence of a leak." On Saturday, Vice President of BP, however, that the pressure inside the well had continued to increase."The fact that the pressure continues to mount gives us more confidence that the test works," he added, stressing that the data are "quite" in the range predicted by the engineers.

The extended testing

As a precaution, the oil company said Saturday it would extend the period of initial testing prévuepour last 48 hours. "We continue in phases of six hours each time. If there is a change in the way we do, we will announce it, "said Mark Salt, a spokesman for BP at the end of this period.

If the test proves successful the well will remain closed until the risk of leak is definitely ruled out by injecting concrete through a relief well. An operation could be completed in early August.However, if a leak is detected, the valve will be reopened and the oil will be pumped to surface ships.

"If we decide to reopen the pit, oil drain into the Gulf for some time," said Mr. Wells, the time to connect the pumping lines at the wellhead. This would obviously a major failure for the oil group that tries since the end of April to contain the largest oil spill in U.S. history.

Since April 22, nearly 520 million gallons of crude that would have flowed into the ocean, estimated Tuesday the International Energy Agency. Even if the leak was finally stopped, Deepwater would remain one of the worst oil spills in history (see graphic below), a nightmare to $ 3.5 billion for BP and irreparable ecological catastrophe.