Task: Question Answering
Input (English): Context: We both paused , our hearts racing not even daring to breathe incase they heard us . Then we heard them start to whisper again and we knew they would n't check into the noise further as I let out a silent sigh of relief . I felt Pete gently tug at my shirt , and as I turned to look at him he pointed towards the back of the shed and motioned for me to follow him . 
Question: What is the reason my sigh of relief is silent ?
Output (English): I am trying to hide and do n't want to be heard.