They gonna project the sound too all at once ?large scale holographic projections.
think of a mile tall mohamad appearing at mecca and saying x,y & z to the people.
kinda like what mysterio did in "spider-man far from home".
in this case it would be a holographic alien invasion projected all around the world at the same time.
then somehow all of the governments get together to form a super earth government.
then we spend the rest of our lives bombarded by NWO holograms of tentacle porn and mega church sermons.
it's gonna be dope.
There's no way a spaceship would be that huge where everyone sees it at one time. And any semblance of inconsistency would be visible