
A live video feed from a BP remotely operated vehicle (ROV) shows the capping stack as it is placed over the source of the BP oil spill in the Gulf of Mexico 12 July 2010. EPA/BP LIVE VIDEO FEED

A live video feed from a BP remotely operated vehicle (ROV) shows the capping stack as it is placed over the source of the BP oil spill in the Gulf of Mexico, 12 July 2010. The former cap was removed allowing the free-flow of oil for several days so the 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 liters) and 172 million gallons (651 million liters) of oil have poured into the Gulf as of 10 July. EPA/BP LIVE VIDEO FEED EDITORIAL USE ONLY / NO SALES / BEST QUALITY AVAILABLE

A live video feed from a BP remotely operated vehicle (ROV) shows a gauge on the capping stack as it is placed over the source of the BP oil spill in the Gulf of Mexico, 12 July 2010. The former cap was removed allowing the free-flow of oil for several days so the 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 EDITORIAL USE ONLY / NO SALES / BEST QUALITY AVAILABLE

A live video feed from a BP remotely operated vehicle (ROV) shows a robotic arm holding a pressure cleaner used to remove debris from the capping stack as preparations continue to place it over the source of the BP oil spill in the Gulf of Mexico 12 July 2010. The former cap was removed allowing the free-flow of oil for several days so the 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 EDITORIAL USE ONLY NO SALES BEST QUALITY AVAILABLE

A live video feed from a BP remotely operated vehicle (ROV) shows crude oil as it escapes unrestricted from the transition spool on top of the Deepwater Horizon BP oil well in the Gulf of Mexico 12 July 2010. A previous cap was removed allowing the free-flow of oil 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 EDITORIAL USE ONLY NO SALES BEST QUALITY AVAILABLE

A BP handout shows pilots work in the ROV control station onboard Discoverer Inspiration to install the 3 Ram Capping Stack onto the Deepwater Horizon BOP, on 12 July 2010 in the Gulf of Mexico. EPA/MARC MORRISON / PB HANDOUT