Maybe its designed to enable many weapons to pass straight through.
I noticed the 'oil canning' in the picture and I assume that this is because of the transport configuration its in. When all the sections are combined the whole ship will exhibit a different stiffness, and there are different levels and kinds of supports when in the ocean (and in dry dock for that matter). I would think that an FEA analysis has been carried out on this exact configuration to assess the stresses and deformations of this part of the ship to make sure nothing permanently deforms.