Dark secrets of Porton Down: Inside controversial defence lab which developed VX nerve agent and used human ‘guinea pigs’ Prison Planet.com Posted on March 16, 2018 Posted in Aggregated No Comments Tagged with Sci Tech UK Mirror | More than 20,000 people have been tested on at the top secret lab which is concentrating on gas attack defences. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email