Top : Games : Video Games : Simulation : Military and Combat : Submarines : 688i

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Jane's Combat Simulations: 688i 
Official site. Program description, system requirements, and screenshots.
http://anthology.janes.ea.com/sims/688i/
Necrom's 688i H/K Command 
Offers program information, history, downloads, and guestbook.
http://www.geocities.com/SiliconValley/Park/9243/688/688index.html