Wikipedia
Seastalker
Seastalker is an interactive fiction computer game designed by Stu Galley and Jim Lawrence and published by Infocom in 1984. Like most of Infocom's works, it was released simultaneously for several popular computer platforms of the time, such as the Commodore 64, Apple II, and IBM PC. The game was marketed as an introduction to interactive fiction for pre-teen players. It is Infocom's twelfth game.
Galley and Lawrence later wrote Moonmist for Infocom.