PASCAGOULA, Miss. - Signal International has completed the final phase of the upgrade of Frontier Drilling semisubmersible Frontier Driller ahead of schedule. The upgrade and modernization program was performed at the East Bank yard in Pascagoula. The rig has now returned to drill for Shell on Viosca Knoll Block 783 in the Gulf of Mexico. (Source: Energy Current, 06/04/09) Signal International is one of the largest marine and fabrication companies in the Gulf of Mexico with two production facilities in Pascagoula and four in Texas.