688 Attack Sub
688 Attack Sub is a submarine simulator game designed by John W. Ratcliff and published for MS-DOS systems by Electronic Arts in 1989.
The player takes command of a US Los Angeles-class or Soviet Alfa class nuclear powered attack submarine and plays 10 missions organized into a Cold War scenario. 688 Attack Sub is known as an early classic of the genre.
John W. Ratcliff followed it up by SSN-21 Seawolf later.