Long time reader first time poster, I’m thinking about selling my copy. Its not sealed but never played (could never get friends to play with me). If anyone is looking for a copy feel free to send me a message.
Just as other ships may, submarines may also move out of a sea zone where they begin their turn with enemy ships, even destroyers. The destroyer doesn’t stop the sub’s movement, as the sub didn’t enter the sea zone - it started off there.