Press a button responsible for releasing pods with new Mechanized Patriots. There's also another lockpick here.
This time the pods are going to be released very slowly and in the meantime you will have to defend yourself against the Vox arriving using barges. There are going to be several Mechanized Patriots and heavily armored Volley Gun users among the standard revolutionists so be careful. Once you've eliminated all the hostiles attach yourself to the sky-line that will transport you to the next deck of the flying machine.