The White House says it expects the Gulf of Mexico oil leak to continue until August after BP failed to seal the well.
BP is to use remote-controlled robots to try to halt the gushing oil spill.
Professor Simon Boxall, an oceanographer at the National Oceanography Centre, examines BP's new tactic.
Holly Pattenden, head oil analyst at Business Monitor International, analyses the impact of the Gulf oil spill on BP.
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