Photos: Huge Containment “Domes” for Gulf Oil Spill

Welders in Port Fourchon, Louisiana, scurry on Monday to finish a 93-ton, four-story-tall oil-containment “dome.” The giant box is the key component of one of three “subsea oil recovery systems” intended to be lowered onto three seafloor leaks spilling an estimated 210,000 gallons (795,000 liters) of oil a day into the Gulf of Mexico.