I absolutely love the use of "unheard"! It enhances the sense of fatality and inevitability conveyed by the previous two lines and brilliantly captures the deafening silence by which time always seems to overpower us. At least that was the feeling I got from this Haiku. Excellent work I must say!

your brilliant at these love them x

It was only 14 words, but you understood completely what happened.

Hermie