BP Turns to Undersea Robots and Containment Valves after Failure of 'Top Kill'

BP is hurriedly devising yet another mix of risky undersea robot maneuvers and containment devices to fight the worst oil spill in US history, after the most ambitious bid yet to stop the Gulf of Mexico gusher ended in failure.

Now, BP hopes to saw through a pipe leading out from the well and cap it with a funnel-like device using the same remotely guided robots that have failed in other tries.

Preparing the country for the possibility of even worse news, the Obama administration on Sunday warned that BP's next effort to contain the oil spewing from a damaged well in the Gulf could result in a temporary 20 percent increase in the flow.

As hurricane season began on the fragile Gulf Coast, BP settled in for the long-term. With the ambitious "top kill" abandoned over the weekend, BP's hope to stanch the leak lies with two relief wells that won't be finished until at least August. The company is, however, trying another temporary fix to contain the oil and siphon it to the surface by sawing through the leaking pipe and putting a cap over the spill.