If you are uncomfortable downloading a third-party trainer, you can achieve a similar "easy mode" effect through modding or console commands, though they are less powerful.
However, these methods require restarting the campaign. The 1.15g trainer remains the only way to toggle invincibility mid-battle while a torpedo is 500 yards away. Cold Waters 1.15g Trainer
The good news: Cold Waters is single-player only. There is no EAC (Easy Anti-Cheat), BattlEye, or VAC (Valve Anti-Cheat). You cannot get banned from Steam for using a trainer. If you are uncomfortable downloading a third-party trainer,
For those who hate the grind of firing a full spread of six Mk48 torpedoes to sink one Oscar-class cruise missile submarine, trainers often provide a damage multiplier. One well-placed torpedo will instantly wreck any surface ship or submarine. However, these methods require restarting the campaign
The 1984 campaign in Cold Waters is brutal. You start with a dated Sturgeon-class sub, and losing a single mission sets the NATO fleet back weeks. Here is how the trainer improves the experience: