Tips and Cheats
Try the depth charge dodge tactic. Often during the game you will have to face a Destroyer level battleship or a Fast Attack Craft, while you are in a submarine, and they will often depth charge you (dropping explosives in your vicinity). To avoid dying because of the explosions, stay around the depth of 10 meters. Keep your periscope up, because you want your opponents to see you--which will cause them to turn toward you. Once they do, fire two torpedos on either side of their hull, which will cause them to evade and stop dropping depth charges at you for a moment. Or, if it doesn't evade, it will be hit with a torpedo and destroyed. If the Destroyer does evade, it will turn back on you eventually, so crash dive to a depth of 150 meters and you can have extra time to hide below the battleship's sonar range--thus, successfully hiding you from the ship.
A cheat for Enigma: Rising Tide is available through a downloadable trainer. A trainer is a program from a third party (not the game developer) that allows you to turn certain features of the game off and on by manipulating, intercepting and altering the memory addresses of a game. The downloadable trainer for Rising Tide (which can be downloaded from the resources link) allows the user to manipulate three things: Unlimited Armor, Unlimited Gun Ammo and Unlimited Torpedoes. To allow the trainer to work, it must be running the background while you play the game, and it only works during single-player missions (and not multiplayer campaigns). Download the trainer but don't open it immediately. Start the game and begin playing, switch back to the Windows screen and open your downloaded trainer program. Once open, the options will be listed in a very basic format allowing you to turn on or off the unlimited armor, guns or torpedos by clicking on the respective box. Once open, leave the trainer running and go back to playing your game. It will now have intercepted the memory of the game and allow you to have unlimited attributes. Leave the trainer on during the remainder of the game and once finished, shut off both of the programs.