How does HE damage actually work?

Overlord: How HE damage works. Brief description:
1. If HE shell managed to penetrate the armor.
- Similar to AP shell, it goes inside the vehicle and explodes there.
- Full damage according to the specs is inflicted, plus HE deals additional damage to internal modules and/or crew. Apart from its basic damage value, each shell has additional value that determines possible damage to crew/internal modules if penetration was successful.
2. If HE shell didn't manage to penetrate or exploded near the tank (eg SPG shot)
- If the explosion took place directly on the armor the damage is reduced by 50%, if the explosion took place near the tank the damage is reduced by 50% plus it gets some extra reduction depending on distance to vehicle.
- Heat wave of HE shell "seeks for" soft spot on the armor, where it is possible to penetrate. Heat wave makes cone-shaped aperture in the armor with approx 45 deg cone angle.
- Vehicle's armor partly absorbs heat damage (each tanks has its own value), including installed spall liner.
- Heat wave damages crew and decreases vehicle's hit points. Modules are not damaged.