General Dynamics [GD] Electric Boat has been awarded a $118 million contract modification by the U.S. Navy to continue concept studies, engineering and design of a Common Missile Compartment for the United Kingdom’s Successor ballistic-missile submarine and the U.S. Ohio replacement submarine.

Electric Boat is a wholly owned subsidiary of General Dynamics.

The award modifies a $76 million contract announced in December 2008 for engineering, technical services, concept studies and design of a Common Missile Compartment for the next-generation ballistic missile submarines under development for the Royal Navy and the U.S. Navy.

If all options are exercised and funded, the overall contract would have a value of more than $600 million.