The king of the Attalan and the well-known Inhuman Blackbolt is arguably one of the powerful characters in the Marvel universe. His quasi-sonic scream can bring about a lot of destruction and even a single whisper can level entire cities.
My question however, is related to his said powers in space/vacuum. Sound cannot travel in vacuum. So, if he is, to say, trapped in a such an environment, his sonic-scream is completely useless.
Or is my understanding of his powers incorrect?