BP has lowered a containment cap onto its damaged wellhead in its attempt to capture the oil gushing into the Gulf of Mexico.

The US Coast Guard said BP attached a cylindrical cap on top of the ruptured well using underwater robots. The cap is only a temporary and partial fix.

BP said it will need up to 24 hours of readings to determine the success rate of the cap because of the uneven flow of oil and gas from the well.

BP has said it does not expect to be able to fully halt the oil flow until August, when two relief wells will be completed.

Meanwhile, BP and the US Government are planning to build several large offshore sand berms to help buffer the Louisiana coast from the oil slick.

The growing petroleum slick has damaged more than 140 miles of Louisiana coastline and largely shut down its seafood industry, putting thousands of fishermen out of work.

The sand-berm construction plan involves the manufacture of six artificial barrier islands with sand dredged from the floor of the Gulf to protect Louisiana’s fragile bayous and marshlands from further damage.

BP will reportedly sell some of its assets, including a 26% stake in Prudhoe Bay on Alaska’s North Slope to pay clean-up costs, fines and legal damages occurred as a result of the massive oil leak, which followed the explosion of the Deepwater Horizon well in April.