30 mlynedd ers trychineb y Sea Empress yn Sir Benfro i ni'n clywed gan y rai oedd yno. We hear about one of the world's biggest oil-tanker accidents, 30 years after the incident.
7 o ddyddiau ar ôl i wylio
48 o funudau
Rhaglenni S4C ar i-Player
iPlayer S4C channel featured episodes
