I live in Senghenydd and a few years goa they rigged up the original Siren which was used to signal the beginning and end of the shifts They also used it to signal a pit emergency by giving 6 long blasts and on the day of the official opening of the memorial gardens.It was an overcast misty morning and the sound coming down the valley was like nothing I 've ever heard before.Can't seem to find the words to do it justice but everybody stopped in their tracks and anyone that heard it that morning couldn't fail to be moved.