The first moments of surprise among the workers were replaced with horror as hundreds of other shapes broke out of the vein, crushing everything and everybody on their way.
Newidodd y momentau cyntaf o syfrdan i arswyd ymysg y gweithwyr wrth i gannoedd o siapau eraill ymddangos o'r wythïen, yn mathru pawb a phopeth yn eu ffordd.