This is one of the stations on the Deepsea Metro in #Splatoon2: Octo Expansion. Each will present Agent 8 with a new challenge, like clearing a stage using only Special weapons. pic.twitter.com/QpK9IXTnSU— Nintendo of Europe (@NintendoEurope) April 16, 2018
So excited for this DLC to come out. I love the single player content in Splatoon 1 and 2, and this looks like it really kicks things up a notch. On top of that, there's definitely some deep story/world building going on here. Very exciting stuff in my opinion!