The American journalist behind the security leaks that prompted criticism from MI5 director general Andrew Parker has firmly denied helping terrorists.
Glenn Greenwald told ITV News it was "a complete lie" that the information he obtained from the former National Security Agency contractor Edward Snowden taught terrorists anything they did not already know.
The Guardian journalist, who gave evidence to Brazil's senate on the matter today, told ITV News' Brazil correspondent Nick Ravenscroft: "It's an absolute fabrication ... There is not one thing that we published that gives any kind of guide".
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A total of 8,648 sailors died during the largest naval engagement during the First World War, which marks its centenary on Tuesday.
The figures by the Global Slavery Index are a third higher than previously thought.
Sara Di Pietrantonio, 22, died in Rome on Sunday.