I'm thinking this may be our Vols? Maybe the missile was fired remotely via computer control? Q also said comms dark. That could mean no comms because no one is actually at the site.

CHINA FIRED THE MISSILE!!

They didn't like the fact that POTUS and Kim were meeting. If NK and SK unite again it removes a ton of power from China. Japan's Abe took that route back home from the summit. China fired a missle from OUR sub using information they obtained from the hack. It was designed to start war with US and Japan.

Another anon pointed out that there was no sound from the missile. It was a part of Sea Dragon, a secret project that was designing a super sonic missile for US ships. Pic related.