In March, the Navy awarded GDEB a $15.4 billion contract modification to support continued work on the Columbia-class ballistic missile submarine program. Under the Columbia-class program, the HII shipbuilding division will construct and deliver six module sections per submarine. What Is the Columbia-Class Submarine? What Is the Virginia-Class Submarine? It serves as the Navy’s premier tactical strike and multimission platform, supporting continuous undersea dominance alongside the Columbia-class fleet.