[Non-Sequitur]

Are these underwater vertical tubes are the horizontal tubes that would shoot these guys into the air? Really are these guys in some device that they are launched in? What kind of word is rejiggered. If I am launched out of a tube I would want it to be at least redesigned and would hold out for engineered.

If you look at the picture at the top, the structure on the deck is most likely for allowing the SEALs and their equipment to exit the sub. Looks like it was built over former missile tubes.

[rottndog]

The structure on top is called a Dry Deck Shelter—It has a large door at the back end that swings open to allow personnel and/or watercraft to exit/enter the boat.

The new Ohio platform probably has many other new features, but the DDS has been around for decades.