Quote Originally Posted by Quadoline View Post
I have the shark build submarine (30 Surveillance) and I already reached all the further sectors (3 stars rank) using the shark build submarine
Sorry, by further sectors I'm referring to those that will be released in 4.4 or 4.5. It was only the last 10 or so sectors that had the surveillance requirements for airships. For now there is no minimum requirement to reach anywhere.