--- title: Are your defence vehicles safe from chemical attacks? description: Discover how digital leakage simulation helps defence teams ensure airtight hulls before welding begins. image: https://www.info.hahsoftware.com/hubfs/ISTAR%20in%20terrain.png --- [Skip to content](https://www.info.hahsoftware.com/hah-software-blog/are-your-defence-vehicles-safe-from-chemical-attacks#main-content) ![](https://www.info.hahsoftware.com/hs-fs/hubfs/HAH_SOFTWARE_LOGO_BLK-1.png?width=5000&height=1325&name=HAH_SOFTWARE_LOGO_BLK-1.png)Homepage - [Home](https://www.info.hahsoftware.com/home) - [Our news](https://www.info.hahsoftware.com/our-news) - [Our team](https://www.info.hahsoftware.com/our-team) [Book a meeting](https://www.info.hahsoftware.com/book-a-meeting-or-demo) - [Home](https://www.info.hahsoftware.com/home) - [Our news](https://www.info.hahsoftware.com/our-news) - [Our team](https://www.info.hahsoftware.com/our-team) [Book a meeting](https://www.info.hahsoftware.com/book-a-meeting-or-demo) ![](https://www.info.hahsoftware.com/hs-fs/hubfs/ISTAR%20in%20terrain.png?width=1536&height=1024&name=ISTAR%20in%20terrain.png) # Are your defence vehicles safe from chemical attacks? ![Gavin Helinski](https://www.info.hahsoftware.com/hs-fs/hubfs/Gavin%20Helinksi%20on%20orange%20-%20low%20res.png?width=48&height=48&name=Gavin%20Helinksi%20on%20orange%20-%20low%20res.png) Gavin Helinski June 11, 2026 Why digital leakage simulation is redefining crew protection in the defence sector ![ISTAR in terrain](https://www.info.hahsoftware.com/hs-fs/hubfs/ISTAR%20in%20terrain.png?width=377&height=251&name=ISTAR%20in%20terrain.png)For ISTAR (Intelligence, Surveillance, Target Acquisition and Reconnaissance) and other protected mobility platforms, armour and active protection systems tend to dominate the conversation. Yet a quieter, less visible vulnerability is rapidly becoming a frontline design priority: **enclosure integrity**. In an era of CNBR (Chemical, Nuclear, Biological and Radiological) threats, the question isn’t simply whether a vehicle is “airtight,” but whether it is sealed against *uncontrolled* air ingress. **Airtight doesn’t mean airless** Modern armoured vehicles are not sealed like submarines. Crews still need breathable air, and that air must come from outside. The difference is that it must enter through a **single, intentional pathway**: the vehicle’s CBRN filtration and overpressure system. This unit draws in external air, filters out contaminants, and pushes clean air into the crew compartment. By maintaining **positive pressure**, the system ensures that if any micro‑gaps exist, air flows *outward*, not inward. But this only works if the hull is tight enough for the overpressure system to do its job. Even a 1mm gap in the wrong place can break the pressure balance, overwhelm filtration, and expose the crew to chemical or biological agents. That’s why “airtightness” in defence engineering really means **no unfiltered air entering the vehicle at any point**. **The hidden vulnerability: structural leaks** Traditionally, leak detection has been a reactive, late‑stage process. Engineers build a physical prototype, fill it with smoke or tracer gas, and manually search for leaks. This “blower door” approach is slow, expensive, and often too late to influence the design. If a leak is discovered after welding, the options are limited: add sealant, add weight, or accept a compromise. In a world where NBC threats are evolving, “close enough” is no longer acceptable. **From reactive testing to ‘secure by design’** HAH Software is bringing Elsyca LeakageMaster to the UK and Ireland defence sector to change this paradigm. Instead of waiting for a physical prototype, designers can now **simulate leakage digitally** during the CAD phase — long before steel is cut or plates are welded. With advanced digital leakage simulation, defence teams can: **Precision that protects lives** Elsyca’s simulations have shown remarkable correlation with physical test results. This isn’t just about reducing prototype costs or avoiding unnecessary sealant weight. It’s about confidence — the confidence that when a vehicle enters a high‑threat environment, the crew is protected by a hull that performs exactly as intended. **The goal is simple:** eliminate vulnerabilities in the digital phase so they never reach the battlefield. If you’re involved in the design or procurement of protected mobility platforms, we’d welcome a conversation. Digital leakage simulation is reshaping how defence teams think about integrity — and redefining what “airtight” truly means. 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