Seapunk seems like a real stretch of the (x)punk way of naming things. Steam, diesel, cyber, and apoc punk all have a much more defined concept. From What I saw on the wiki page this is just anything bluish and aquatic themed. When I heard the term the first thing that came to mind would be a post-apocalyptic scenario involving a world covered mostly by water. (There's a movie based on that, right? Waterworld or something?) This sounds like dumb asses trying to have a cool name for "aquatic themed".