Aid to the Church in Need have video footage of a Chinese Bishop, imprisoned until his death and buried without any reference to the Church.
They sell notelets with watercolour images that he painted. I once gave my Grandmother (RIP) some for Christmas.
Very strange to find that a present you gave someone a few years ago has anything to do with someone seen waving a crucifix from a barred window. We're obviously all linked a little closer than I realised.