The massive new assembly hall, which measures more than 430,000 square feet, has enough room for two parallel production lines; each production line has one half dedicated to assembling and attaching together submarine modules, and the other half dedicated to finishing the hull with quieting measures like anechoic tiles. That's enough space for four SSN's to be built simultaneously (two sets of modules being assembled at one end, and another pair of assembled hulls being fitted out before launch). Once completed, the SSN is rolled off the line and into the ocean. The assembly hall can also handle construction of the next generation SSBN, the Type 096