In April 2015 I spent an unforgettable 4 days exploring the radioactively contaminated exclusion zone in and around Chernobyl, now part of Ukraine. I went with a group of about 30 other urban explorers, many of whom had been a number of times before. Rather than paying for expensive day trips all the way from Kiev we were able to stay in the workers’ city of Slavutych and take a train with the workers each morning directly into ‘the zone’.…