I don’t use Instagram, but I found this with some pics of some 3120s
https://www.instagram.com/p/Ce6KuR3tL4C/
And here’s another thing about them: https://www.aliexpress.com/p/wiki/article.html?keywords=3120-skate-shoes
And someone in 2005 who was looking for them but thinks the company disappeared
https://ben.blog/2005/02/07/3120-shoes/
Not sure about the magazine though, sorry.




This doesn’t answer your question at all, but if you’re interested in undersea cables, you may enjoy Jon Bois’ brilliant and bizarre history of the telegraph, and especially the 3rd and 4th parts (although it’s all very worth watching).
A degree of familiarity with 90s sitcom Home Improvement would also be helpful, though not essential.