Recently, Bluewater fleet naval trees were extended to rank VII, and as a result we’ve now updated the research system to make progression faster and more balanced overall. The infographic shows the updated cost for researching and purchasing Bluewater fleet ships at each rank for each nation.
(The cost of researching and purchasing Bluewater fleet ships at ranks I-VII has been altered (generally reduced). Values of the following parameters have been changed: the purchase price in Silver Lions, the crew cost, the Expert crew price, the price of modifications in Silver lions, the amount of research points needed to research a vessel, and the amount of research points needed to unlock modifications.
Note that the calculations do not take into account grouped vehicles, since their research and purchase are not required to advance through the Bluewater fleet research trees.