Depth of Defense

You are the protective-structures engineer. Every meter you dig, every layer you choose, changes whether a penetrator stops short — or breaks through. This is not abstract: it's the real physics of penetration depth, shock attenuation, and spall. Learn it, or watch your shelter fail.

💰 Excavation & Materials Budget

Spent0

Limit0

⚡ Apply to All Layers

🧱 Layer-by-Layer Design (top → bottom)

📍

📊 Live Penetration Analysis

Predicted Penetration Depth

–

How far the threat travels before stopping

Depth Margin

–

Remaining shelter depth below the stop point

Shock Overpressure at Shelter

–

Attenuated blast pressure reaching the protected space

Spall Risk

–

Fragments ejected from the rear face of a hard layer under shock

Cost Used

–

Below 1.0 margin ratio = breach. Above = survives.