https://www.pcgamer.com/someone-left-a-hidden-message-in-metal-gear-survive/

A fan has unveiled a secret message in Metal Gear Survive. 

I'm not going into the messy break-up between Konami and former golden child, Hideo Kojima—it's well documented already—but suffice to say, all eyes were on Konami and its first Metal Gear game post-Kojima, Metal Gear Survive.