diff --git a/packages/i18n/strings/en.json b/packages/i18n/strings/en.json
index caa25ce0f..65bdf40fc 100644
--- a/packages/i18n/strings/en.json
+++ b/packages/i18n/strings/en.json
@@ -790,6 +790,7 @@
           "fire.caliber": "caliber",
           "fire.standardPenetration": "standard penetration",
           "fire.premiumPenetration": "premium penetration",
+          "fire.tertiaryPenetration": "tertiary penetration",
           "fire.damage": "damage",
           "fire.moduleDamage": "module damage",
           "fire.shellVelocity": "shell velocity",
diff --git a/packages/website/src/components/TankSearch/components/Card.tsx b/packages/website/src/components/TankSearch/components/Card.tsx
index f5531692a..34d9234ec 100644
--- a/packages/website/src/components/TankSearch/components/Card.tsx
+++ b/packages/website/src/components/TankSearch/components/Card.tsx
@@ -27,6 +27,7 @@ export function TankSearchCard({ tank, onSelect }: TankSearchCardProps) {
     const gun = turret.guns.at(-1)!;
     const shell0 = gun.gun_type!.value.base.shells[0];
     const shell1 = gun.gun_type!.value.base.shells[1];
+    const shell2 = gun.gun_type!.value.base.shells[2];
     const tracks = tank.tracks.at(-1)!;
     const engine = tank.engines.at(-1)!;
     const tankModelDefinition = modelDefinitions.models[tank.id];
@@ -57,6 +58,8 @@ export function TankSearchCard({ tank, onSelect }: TankSearchCardProps) {
         return shell0.penetration.near.toFixed(0);
       case 'fire.premiumPenetration':
         return shell1 ? shell1.penetration.near.toFixed(0) : '--';
+      case 'fire.tertiaryPenetration':
+        return shell1 ? shell2.penetration.near.toFixed(0) : '--';
       case 'fire.shellVelocity':
         return shell0.velocity.toFixed(0);
       case 'fire.shellCapacity':
diff --git a/packages/website/src/components/TankSearch/components/Sort.tsx b/packages/website/src/components/TankSearch/components/Sort.tsx
index 7a43836a5..8a201c849 100644
--- a/packages/website/src/components/TankSearch/components/Sort.tsx
+++ b/packages/website/src/components/TankSearch/components/Sort.tsx
@@ -63,6 +63,7 @@ export function Sort() {
             <Item by="fire.caliber" />
             <Item by="fire.standardPenetration" />
             <Item by="fire.premiumPenetration" />
+            <Item by="fire.tertiaryPenetration" />
             <Item by="fire.damage" />
             <Item by="fire.moduleDamage" />
             <Item by="fire.shellVelocity" />
diff --git a/packages/website/src/components/TankSearch/index.tsx b/packages/website/src/components/TankSearch/index.tsx
index 0d03cc671..1c8245725 100644
--- a/packages/website/src/components/TankSearch/index.tsx
+++ b/packages/website/src/components/TankSearch/index.tsx
@@ -238,6 +238,16 @@ export const TankSearch = memo<TankSearchProps>(
             );
             break;
 
+          case 'fire.tertiaryPenetration':
+            sorted = filtered.sort(
+              (a, b) =>
+                (a.turrets.at(-1)!.guns.at(-1)!.gun_type!.value.base.shells[2]
+                  ?.penetration.near ?? 0) -
+                (b.turrets.at(-1)!.guns.at(-1)!.gun_type!.value.base.shells[2]
+                  ?.penetration.near ?? 0),
+            );
+            break;
+
           case 'fire.damage':
             sorted = filtered.sort(
               (a, b) =>
diff --git a/packages/website/src/stores/tankopediaPersistent/constants.ts b/packages/website/src/stores/tankopediaPersistent/constants.ts
index 49bc4bda1..52f03f645 100644
--- a/packages/website/src/stores/tankopediaPersistent/constants.ts
+++ b/packages/website/src/stores/tankopediaPersistent/constants.ts
@@ -14,6 +14,7 @@ export const SORT_UNITS: Record<TankopediaSortBy, string | undefined> = {
   'fire.gunDepression': '°',
   'fire.gunElevation': '°',
   'fire.premiumPenetration': 'mm',
+  'fire.tertiaryPenetration': 'mm',
   'fire.reload': 's',
   'fire.shellVelocity': 'm/s',
   'fire.shellRange': 'm',