Chevron Corporation has announced that the Big Foot tension-leg platform (TLP) will be moved to sheltered waters from its location in the deepwater U.S. Gulf of Mexico following damage to its tendons during attempted installation of the platform late in May. Tendons are the long, ultra-strong steel pipes that connect the platform to the seabed and are typically buoyant. The tendons were pre-installed to the seafloor with the top end floating below the water surface in preparation for connection to the TLP. It appears that nine of the 16 tendons lost buoyancy and fell to the seafloor. No injuries or environmental damage have been reported with the incident, and the TLP itself was not affected.

The problem is quite serious and Chevron will need to rebuild at least some of the tendons. This will result in a significant delay in start-up of the platform and will likely increase project cost beyond its current $5.1 billion estimate. Big Foot will ultimately be installed in approximately 5,200 ft of water, which is the deepwater depth for a TLP. It will also be the largest TLP in the Gulf of Mexico.