Revelation 10:3-4

3 And cried with a loud voice, as when a lion roareth: and when he had cried, seven thunders uttered their voices.

4 And when the seven thunders had uttered their voices, I was about to write: and I heard a voice from heaven saying unto me, Seal up those things which the seven thunders uttered, and write them not.

The angel speaks and gives seven thunders that John was told to seal up and not to write. Since the thunders are not told and are sealed it is not for the Church to know at this time. The seven thunders are proclamations of some sort that tell the world the truth about the deception they were under but there is no use speculating about what we cannot know. Those who claim to know the messages of the thunders are simply self-deceived.