That day in 1966 when Pantglas Junior School was engulfed by waste from the colliery, killing 116 children and 28 adults, must never be forgotten.
Ni ddylid byth anghofio’r diwrnod hwnnw, a ddigwyddodd yn 1966 pan amlyncwyd Ysgol Gynradd Pantglas gan wastraff glo, a lladd 116 plentyn a 28 o bobl.