Since BP capped its ruptured well, the Gulf oil spill has shrunk dramatically. The Gulf itself is breaking down the oil at top speed, but past spills indicate the effects could linger for decades.
Engineers may have to bring in a second saw to finish the cut-and-cap operation.
While robots attempt to stop the BP oil spill, crude oil is getting closer to beaches on the Florida Gulf coast.
More than three million feet of boom has been deployed along the coast, but it's not a fail-safe method.
The Gulf of Mexico seafood industry is insisting that the oil spill has caused no major damage yet. But if nursery grounds are harmed, the impact could be serious.
The US military has joined the effort to contain the Gulf of Mexico oil spill. It's been declared an event of 'national significance,' meaning more resources will be available.
The Deepwater Horizon oil rig explosion comes three weeks after the Obama administration proposed opening up parts of the Gulf for deepwater exploration. Two Democratic senators are raising broader safety concerns.