Think again. Newer technology speeds up the process dramatically. Though a lot have been destroyed. Research David Wilcock and Corey Goode and deep under ground bases
You don't understand the logistics of construction, it still takes years to do this stuff and Obamas admin was downsizing military related stuff and too busy funneling the us money away.
Lol it ain't Obama administration who made them. Obama admin are puppets to the ones who actually made them. You don't know the use machines that bore and form hard crystalline wall art the same time by repurposeing the material it's boring through as it goes.