I agree that by definition the manse was aeons isolated from rest of the world, until now recently exploration has been started carefully. Some piracy/trading done with vessel (kill original pirate crew or found sunken ship which they salvaged and repaired so it matches present era ships). But in regards 'recruiting' new inhabitants how the process usually goes? Is it sort benevolent kidnapping or did manse in century create a 'false god' at one islands which has tribal natives and false god demands 'young men and women' every decade as sacrifice and thrown into ocean....where submerged ship then collects the sacrificial victims and added to community in the manse?