Llun du a gwyn o long ager, gyda pedwar mast a A black and white image of a steamship fills the frame she has four short masts and a funnel at the centre.

Canfod y llong a anfonodd rybudd i'r Titanic

Mae technoleg bwerus newydd yn datgelu strwythurau coll yng ngwely'r môr 

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