diff --git a/src/components/ArmorMesh/components/Armor/index.tsx b/src/components/ArmorMesh/components/Armor/index.tsx
index 7263fb04a..11074b576 100644
--- a/src/components/ArmorMesh/components/Armor/index.tsx
+++ b/src/components/ArmorMesh/components/Armor/index.tsx
@@ -186,22 +186,18 @@ export function ArmorMesh({
 
           if (mesh.current !== (coreArmorMesh as unknown as Mesh)) return;
 
-          let accumulatedThickness = 0;
-          const armorPiercingLayers = intersectionsTillFirstCoreArmor.map(
+          const armorPiercingLayersRaw = intersectionsTillFirstCoreArmor.map(
             (event, index) => {
               switch (event.object.userData.type) {
                 case 'externalModule': {
-                  accumulatedThickness +=
-                    event.object.userData.thickness * thicknessCoefficient;
-
                   return {
                     nominal:
                       event.object.userData.thickness * thicknessCoefficient,
                     angled:
                       event.object.userData.thickness * thicknessCoefficient,
                     ricochet: false,
-                    block: accumulatedThickness > resolvedPenetration,
                     type: 'external',
+                    distance: event.distance,
                   } satisfies ArmorPiercingLayer;
                 }
 
@@ -235,28 +231,62 @@ export function ArmorMesh({
                   const angled =
                     (event.object.userData.thickness * thicknessCoefficient) /
                     Math.cos(angle - degToRad(normalization));
-                  accumulatedThickness += angled;
 
                   return {
                     nominal:
                       event.object.userData.thickness * thicknessCoefficient,
                     angled,
                     ricochet,
-                    block: accumulatedThickness > resolvedPenetration,
                     type:
                       event.object.userData.type === 'coreArmor'
                         ? 'core'
                         : 'spaced',
+                    distance: event.distance,
                   } satisfies ArmorPiercingLayer;
                 }
               }
             },
           );
+          const gaps = armorPiercingLayersRaw.map((layerA, aIndex) => {
+            if (aIndex === armorPiercingLayersRaw.length - 1) return null;
+            const layerB = armorPiercingLayersRaw[aIndex + 1];
+
+            return {
+              type: 'gap',
+              gap: Math.abs(layerB.distance - layerA.distance),
+            } satisfies ArmorPiercingLayer;
+          });
+          const armorPiercingLayers: ArmorPiercingLayer[] = [];
+
+          armorPiercingLayersRaw.forEach((layer, index) => {
+            const gap = gaps[index];
+
+            armorPiercingLayers.push(layer);
+            if (gap) armorPiercingLayers.push(gap);
+          });
+
+          console.log(armorPiercingLayers);
+
+          let remainingPenetration = resolvedPenetration;
+          let accumulatedThickness = 0;
+          const explosiveCapable = isExplosive(shell.type);
+
+          armorPiercingLayers.forEach((layer) => {
+            if (layer.type !== 'gap') {
+              remainingPenetration -= layer.angled;
+              accumulatedThickness += layer.angled;
+            } else if (explosiveCapable) {
+              // there is a 50% penetration loss per meter for HE based shells
+              remainingPenetration -= 0.5 * remainingPenetration * layer.gap;
+            }
+
+            remainingPenetration = Math.max(0, remainingPenetration);
+          });
 
           const hasRicochet = armorPiercingLayers.some(
-            ({ ricochet }) => ricochet,
+            (layer) => layer.type !== 'gap' && layer.ricochet,
           );
-          const hasPenetrated = resolvedPenetration >= accumulatedThickness;
+          const hasPenetrated = remainingPenetration >= accumulatedThickness;
 
           mutateTankopediaTemporary((draft) => {
             draft.shot = {
diff --git a/src/components/ShotDisplay.tsx b/src/components/ShotDisplay.tsx
index 16e3f6378..6910b8ea7 100644
--- a/src/components/ShotDisplay.tsx
+++ b/src/components/ShotDisplay.tsx
@@ -106,23 +106,32 @@ export function ShotDisplay() {
                   paddingLeft: shot.thicknesses.length > 1 ? 8 : undefined,
                 }}
               >
-                {shot.thicknesses.map(({ nominal, angled, type }, index) => (
+                {shot.thicknesses.map((layer, index) => (
                   <Flex gap="2">
                     {shot.thicknesses.length > 1 && (
                       <Text>
-                        {index + 1}. {type[0].toUpperCase()}
-                        {type.slice(1)}
+                        {index + 1}. {layer.type[0].toUpperCase()}
+                        {layer.type.slice(1)}
                       </Text>
                     )}
 
                     <Flex gap="1">
-                      <NominalPenetration width={24} height={24} />
-                      <Text>{nominal}mm</Text>
+                      {layer.type !== 'gap' && (
+                        <NominalPenetration width={24} height={24} />
+                      )}
+                      <Text>
+                        {Math.round(
+                          layer.type === 'gap'
+                            ? layer.gap * 1000
+                            : layer.nominal,
+                        )}
+                        mm
+                      </Text>
                     </Flex>
-                    {type !== 'external' && (
+                    {layer.type !== 'external' && layer.type !== 'gap' && (
                       <Flex gap="1">
                         <AngledPenetration width={24} height={24} />
-                        <Text>{Math.round(angled)}mm</Text>
+                        <Text>{Math.round(layer.angled)}mm</Text>
                       </Flex>
                     )}
                   </Flex>
diff --git a/src/stores/tankopedia.ts b/src/stores/tankopedia.ts
index 4fba02d7b..eccabe1d5 100644
--- a/src/stores/tankopedia.ts
+++ b/src/stores/tankopedia.ts
@@ -76,13 +76,18 @@ export type Shot = {
   angle: number;
 };
 
-export interface ArmorPiercingLayer {
-  nominal: number;
-  angled: number;
-  ricochet: boolean;
-  block: boolean;
-  type: 'core' | 'spaced' | 'external';
-}
+export type ArmorPiercingLayer =
+  | {
+      distance: number;
+      nominal: number;
+      angled: number;
+      ricochet: boolean;
+      type: 'core' | 'spaced' | 'external';
+    }
+  | {
+      type: 'gap';
+      gap: number;
+    };
 
 export const useTankopediaPersistent = create<TankopediaPersistent>()(
   persist(