A 700m starship colliding with Earth could cause planet wide devastation. We can only hope they are able to soften the landing
Its *so* easy to destroy life on a planet that stuff like the death star is not necessary. Simply accelerate a small object to sufficient speed at a planet and its good bye planet. Thanks e=mc2 ! All Federation planets should have a planetary shield to absorb such things.
Also I would not like to be anywhere near a crashed starship if the anti-matter containment field dies.