Those originally in possession of the Dead Sea Scrolls refused to share the information (like a bunch of babies not sharing thier new toy). But then one of them gave an outsider what amounts to basically a concordance which listed the order of each word, they guy wrote a program to reproduce the text from that and published, and those the jig was up. The only reason we ever got access to them was this. Ya, it angers me.
The dead sea scrolls contain a complete copy of the Book of Isaiah which clear predicts Christ on the cross in chapter 53, the accusation was always that it was added after the fact, but the Dead Sea Scolls have the complete book, and it predates Christ by hundreds of years, not only that, but it’s word for world accurate with our current text, showing how carefully the word was preserved.