688 has a very good campaign, featuring nice videos and all.
It has even a "gamey" upgrade system in which you can buy with the points earned from completing missions, allowing you to work around the fact there is only 1 playable submarine, as by customising it then you could "simulate" that you are driving some other sub.
I think this makes the campaign more enjoyable than in the later Sub Command and Dangerous Waters.
Something 688 has that Sub Command and Dangerous Water do not is the possibility to actually "hear" the faint sound coming from the enemy sub while you study the waterfall in broadband, you did not have to only use the waterfall and sonar peaks to figure out a contact.
This feature was removed in a Sub Command patch, as Sonalyst toned down a very lot the sound produced by the subs, so you could not really hear them anymore yourself (as the sound of the water was then higher) you could only hear the surface vessels, torpedoes and biologic, and from what i read Sonalyst kept those the same in Dangerous Water.
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