There was a documentry on the box recently about the “supergun” and its inventor, he was a really clever guy. Unfortunately he couldn’t see the trouble he was getting into with his invention, or how it would upset other countries in the region. I cant remember his name (I know he was Canadian). He was found murdered outside his flat, alledgedly asassinated by ■■?
Regards Kevmac47 Ps Chaversdad is right the tubes were in Tees Dock for months, maybe years.