Deepest mine explore - maenofferen slate quarry

I explore a deep mine on north Wales , maenofferen slate quarry a interesting explore with abandoned work shops , underground caverns and buildings and more even some of the old relics from mine workers are left behind such as tools , cigarette wrappers and even food packets and more . this is one of the biggest mines to explore with several floors that keep going down. if you enjoy this exploring video feel free to subscribe , like and comment