A British Petrolium (BP) handout photograph released on 11 July 2010 shows Workers onboard the Transocean Discoverer Inspiration retrieve the flange overshot tool used to remove the flange from the Deepwater Horizon BOP in the Gulf of Mexico on 11 July 2010. The flange was the only remaining portion of the original riser connection. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/MARC MORRISON / BP / HANDOUT EDITORIAL USE ONLY/NO SALES
A British Petrolium (BP) handout photograph released on 11 July 2010 shows Workers onboard the Transocean Discoverer Inspiration retrieve the flange overshot tool used to remove the flange from the Deepwater Horizon BOP in the Gulf of Mexico on 11 July 2010. The flange was the only remaining portion of the original riser connection. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/MARC MORRISON / BP / HANDOUT EDITORIAL USE ONLY/NO SALES
A British Petrolium (BP) handout photograph released on 11 July 2010 shows Workers onboard the Transocean Discoverer Inspiration retrieve the flange overshot tool used to remove the flange from the Deepwater Horizon BOP in the Gulf of Mexico on 11 July 2010. The flange was the only remaining portion of the original riser connection. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/MARC MORRISON / BP / HANDOUT EDITORIAL USE ONLY/NO SALES
A British Petrolium (BP) handout photograph released on 11 July 2010 shows the deployment of the 3 Ram Capping Stack on the Transocean Discoverer Inspiration to the Deepwater Horizon BOP in the Gulf of Mexico on 11 July 2010. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/MARC MORRISON / BP / HANDOUT EDITORIAL USE ONLY/NO SALES
A British Petrolium (BP) handout photograph released on 11 July 2010 shows workers onboard the Transocean Discoverer Inspiration deploying the 3 Ram Capping Stack to the Deepwater Horizon BOP in the Gulf of Mexico on 11 July 2010. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/MARC MORRISON / BP / HANDOUT EDITORIAL USE ONLY/NO SALES
The United States Navy's MZ-3A Airship preprase to take off at Brookley Field in Mobile, Alabama USA after patrolling the Gulf of Mexico coastline for oil on 11 July 2010. The Airship, owned by the Navy, under the command of the Coast Guard, and operated by Integrated Systems Solutions Inc, is considered a more effective tool in spotting oil near the coastline due to the relative slow speed at which it can fly. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/DAN ANDERSON
The United States Navy's MZ-3A Airship prepares for its next mission at Brookley Field in Mobile, Alabama USA after patrolling the Gulf of Mexico coastline for oil on 11 July 2010. The Airship, owned by the Navy, under the command of the Coast Guard, and operated by Integrated Systems Solutions Inc, is considered a more effective tool in spotting oil near the coastline due to the relative slow speed at which it can fly. The BP Deepwater Horizon oil spill, which began two months ago, is the largest in US history and continues to threaten wildlife, the ecosystem and the economy of the Gulf Coast as BP and government officials attempt to stop the flow and remove what has already been released. EPA/DAN ANDERSON
Handout photo released on 11 July 2010 shows workers onboard the Transocean Discoverer Inspiration deploy a flange overshot tool designed to remove the flange on the Deepwater Horizon BOP on 10 July 2010 in the Gulf of Mexico. The flange is the only remaining portion of the original riser connection and is bolted on top of the BOP. EPA/MARC MORRISON EDITORIAL USE ONLY, NO SALES
The Transocean Discoverer Inspiration, foreground, arrives at the sight of the Deepwater Horizon to install a 'capping stack' on the well, July 10, 2010 in the Gulf of Mexico. The well has been leaking oil into the Gulf since an explosion on the rig April 20, 2010 caused a blow out. EPA/MARC MORRISON / HANDOUT
Workers install a choke on the 'capping stack' onboard the Transocean Discoverer Inspiration in preparation of attaching it to the Deepwater Horizon well July 10, 2010 in the Gulf of Mexico. The well has been leaking oil into the Gulf since an explosion on the rig April 20, 2010 caused a blow out. EPA/MARC MORRISON / HANDOUT EDITORIAL USE ONLY/NO SALES
A live video feed from a BP remotely operated vehicle (ROV) shows crude oil as it escapes unrestricted after a containment cap was removed from the Deepwater Horizon BP oil well in the Gulf of Mexico 10 July 2010. The cap was removed allowing the free-flow for at least two days so a new seal can be put in place that is hoped will stop the flow altogether. Officials caution that the best bet for stopping the flow is still two relief wells that are scheduled for completion in mid-August. It is estimated that between 87 million gallons (329 million litres) and 172 million gallons (651 million litres) of oil have poured into the Gulf as of 10 July. EPA/BP LIVE VIDEO FEED / HANDOUT EDITORIAL USE ONLY NO SALES BEST QUALITY AVAILABLE
