As part of the renovation of the M2 metro line in Budapest, Cegelec is installing a new fire protection system which is more infrastructure-friendly. In charge of supplying and installing a new ventilation and fire protection system, Cegelec selected a system based on sprays which emit fine droplets of water to form a mist. This technology, applied in recent years only for newly-built underground railways, extinguishes fires by a cooling and oxygen-depleting effect of the fine water mist-vapour. This solution is more effective than the traditional water jets, as it reduces collateral water damage and has the added advantage of absorbing harmful combustion products while the fire is being extinguished.