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Last Updated: Wednesday May 05 2010 06:09 GMT

Special funnel to stop oil leak

Workers build the Pollution Control Dome

Workers are desperately trying to build a huge funnel to stop a massive oil leak off the coast of Louisiana.

Thousands of litres of oil has been gushing out of a pipe under the sea off the coast of America, after an oil rig exploded and sank on 22 April.

The company that run the rig, called BP, is building a giant metal box to lower onto the leaky pipe, which will pump the oil into special boats.

They've already tried using robots to stop the leak but that hasn't worked.

The 98-tonne box is being built by steel workers.

How do you stop an oil spill?

Funnels like this have been used before, but they've never been sent down so deep. The oil leak is about a mile below the surface.

Clean-up teams are also surrounding the spill with big inflatable barriers to stop the oil spreading.

Animals at risk

They've also tried burning the oil and spraying it with chemicals to get rid of it.

Wildlife experts are really worried that lots of animals could die. It's thought that oil could start swamping the coast soon.