Hyper Voice through Substitute?

Question

I was on battle spot, and a Mega Mence used Hyper Voice on my Heatran behind a sub. How exactly is it going through a sub?

Comments

It's just how the game works, some moves will break through subs and some will ignore it entirely. examples are bug buzz and hyper voice. I think it has something to do with sound. Because bug buzz in vibration from a bugs wings and hyper voice is a shout.

Answer 1

It went though because "Sound Attacks" go through Substitute

Moves like Bug Buzz, Uproar and Hyper Voice will go through Subs.
List of moves that break a Substitute :

See here for more details on Hyper Voice