User blog comment:Kaido King of the Beasts/Chapter 818: Stepping Stones to One Piece/@comment-910220-20160303173010/@comment-72.168.160.165-20160303192240

Ever since Noah debuted at Fishman Island, I've been curious about a possible connection between Noah and the migration of the fishmen, and Enel's return to the "Fairy Vearth". I've long doubted that Enel came up with the design for Maxim on his own, so I thought he might taken the design (or at least the inspiration) from some ruin in Birka. If there was ever any travel back to the Moon before Enel, they could've taken a Poneglyph up with them.