[WAD][1766] Submarine noise

[Knightpawn]

I am noticing that at 5knts Virginia class submarines at a 2.5db noise level (!) and Los Angeles Class at 11.2 db which is lower than a modern conventional running on battery

In the attached scenario I added a S120 Greek batter sub for comparison that emits 12db

Is this WAD?

[Dimitris]

WAD. Certain modern nuclear submarines have natural circulation for their reactor coolant (signified by the "Advanced Propulsion" flag in the DB) which allows them to avoid the "disproportionate noise at creep" penalty that nukes usually have due to their reactor pumps. As a result, they are extremely stealthy at shaft speeds up to 10-15 knots.