SSN 21 Seawolf was the first submarine simulation game I've ever played. It has very good graphics for a 1990s game, and portrays the submarine based fight quite realistically. In SSN 21 Seawolf, you are the commander of the SSN 21 Seawolf, the supreme nuclear submarine of the cold war era. In this game, your objectives are usually the gathering of intelligence, and sinking enemy naval units (battleships, cargo ships, and enemy nuclear subs).
SSN 21 Seawolf is armed with many kinds of weaponry, ranging from many types of torpedoes, to under-sea launched missiles.
The torpedoes are vastly different from those ones that most people are familiar with from those used in u-boats during WWII. Most of the torpedoes are capable of tracking enemy naval units by tracking their engine sounds. SSN 21 seawolf carries many different types of torpedoes that allow the player to use in different kinds of situations. For example, when attacking an enemy ship, the player may use the long range 'tracking' torpedoes, and when engaging enemy submarines, the player might use the fast-speeed, but shorter-range 'tracking' torpedoes.
When not engaging enemy naval units, players are usually at the command station watching the sonar screens to listen to the enemy submarines. This sonar can detect the sound of enemy subs that are miles
away, but careful, it can also detect a dolphin's whistle, so make sure you identify the 'blip' you see on the sonar screen before chasing it. Also when you 'ping' to search for enemy subs, you are also giving away your position to the enemy as well, so be careful when you 'ping'.
Now let's talk about SSN 21 seawolf's vitality. The submarine can only take two torpedo shots. However, the sub has a mechanism like the flares in the fighter jets, that shoots out 'loud sound making' things to mask SSN 21 seawolf's engine sounds. So if you see enemy torpedoes chasing you, you shoot those things and change course, dive / rise up, and hopefully the torpedoes won’t chase you. But be warned, those pesky enemy torpedoes can come back for 2nd or even 3rd try, until they run out of fuel. So this pretty much sums everything. Give this game a try if you want to taste some nuclear sub actions.