Board Thread:Game Updates/@comment-1820055-20150701022818/@comment-26574811-20150727010801

Shinhwalee wrote: Event Start date is August 10th. GET READY

The Devs are also highly recommending in preparing your Heavy Ships (BB and CVs) for the Event.

現 在「艦これ」運営鎮守府では、「艦これ」夏イベント2015：期間限定海域【反撃！第二次SN作戦】の開発/実装準備を進めています. 同夏イベの作戦開始 は、来月【8/10】予定です. 作戦参加予定の提督方は、精強な空母機動部隊を含む層の厚い艦隊戦力を整備して頂けますと幸いです.

https://twitter.com/KanColle_STAFF/status/625466114005336064 No, that "層の厚い" doesn't mean heavy ships. It's the dev's way to hint ship lock.

The twitter translates to this:

''The devs are preparing for Summer 2015 event: Counterattack! Second Operation SN. The event is scheduled to start at Aug 10th. Admirals who want to participate should prepare a fleet with enduring combat capability, including an elite carrier force.''

層の厚い literally means "having thick layers of", and is used to describe a fleet that is abundant of reserve ships (instead of having thick armor), this term has been used to imply the ship lock system for quite a while.