60		Enigma: Rising Tide (Windows, 2003)
60		Submarine Commander (Windows, 2010)
60		Sub Command: Akula Seawolf 688(I) (Windows, 2001)
55		USS Stinger (DOS, 1989)
54		Up Periscope! (DOS, 1988)
53		Sub Battle Simulator (DOS, 1987)
50		1914: Shells of Fury (Windows, 2007)
42		GATO (DOS, 1984)
42		Jane's Combat Simulations: 688(I) Hunter/Killer (Windows, 1997)
41		Merlin Challenge (DOS, 1993)
40		Coast Guard (Windows, 2015)
40		The Good Life: The Tropical Paradise Simulation (Windows, 2012)

Notes: Games similar to 688 Attack Sub, Games like 688 Attack Sub, Electronic Arts, Inc., Electronic Arts, Inc., DOS, Simulation, 1st-person, Naval, Watercraft, Submarine, PC, Game Similarities.