Probably I missed something with "how HE damage works"?

[_Lupastro_]

Just finished a battle with my Myoko.

 

There was an Atlanta in open sea with full HP. I've fired a full salvo with HE from approx 13km distance and I've obtained 2 pentration tags and.. 0 damage???

 

Did I missed something with how damage system works?

[rnat]

Chances are you hit Main Battery turrets and/or AA mounts, those modules have seperate HP-pools.

[wilkatis_LV]

Same as with AP 0 dmg pens - modules, spaced armour, saturation...