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The shelters of the Italian Metallurgical Society

Viale Luigi Orlando, 325, 51028 Campo Tizzoro, San Marcello Pistoiese PT, Italia ★★★★☆ 113 views
Marika Leone
Campo Tizzoro, San Marcello Pistoiese
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Art, Theaters and Museums · Campo Tizzoro, San Marcello Pistoiese

The shelters of the Italian Metallurgical Society - Campo Tizzoro, San Marcello Pistoiese | Secret World Trip Planner

The S.M.I. (Italian Metallurgical Society) was a company of fundamental importance during the last two wars, as it mainly produced munitions. And for the same reason it was a target for any enemy. In order to protect its workforce (about 7000 workers at the peak of production), in 1930 the company proceeded with the construction of the largest private anti-aircraft shelter in the world, a system of tunnels for a total of about 1680 metres built at a depth of 20 metres, excavated in the rock and protected at every point by one metre of reinforced concrete. The particular ogive entrances guaranteed an indestructible access from the surface, and various technical devices allowed the evacuation of all the workers and their families from the factory-village in a very short time. The tunnels, actually used from 1940 to 1944, were equipped with infirmaries, air and water treatment rooms, a chapel and, in the last year of the war, even schoolrooms. The inscriptions on the walls are remarkable: "Did you know that a person walking around consumes 2 to 5 times more air than a person sitting quietly?", "In case of unforeseen situations, discipline is the best guarantee of safety" or "Be calm. You already have shelter in these stairs." A visit to the galleries also includes the museum about S.M.I., a company that was in operation until 2005. In addition to its history, the exhibition illustrates the research and innovation behind the company's production and management, such as the ultra-modern workplace safety rules (from 1912), as well as the plans behind the entire (futuristic for the time) industrial village, and the construction of the shelters themselves.

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  1. 🌅
    Morning
    The shelters of the Italian Metallurgical Society
    📍 Campo Tizzoro, San Marcello Pistoiese
  2. ☀️
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    The Madonnina Icehouse
    📍 3.9 km · Campo Tizzoro, San Marcello Pistoiese
  3. 🌆
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    The suspension bridge of the ironworks
    📍 7.9 km · Campo Tizzoro, San Marcello Pistoiese

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Frequently Asked Questions

The S.M.I. shelters are the world's largest private anti-aircraft shelter system, built in 1930 by the Italian Metallurgical Society to protect its 7,000 workers during wartime bombing. The complex consists of approximately 1,680 metres of tunnels excavated 20 metres deep into rock and reinforced with one metre of concrete, which were actively used from 1940 to 1944.
The tunnels were equipped with infirmaries, air and water treatment rooms, a chapel, and schoolrooms added during the final year of the war. The shelters also featured innovative safety messaging on the walls to educate workers about air consumption and emergency protocols, such as 'Be calm. You already have shelter in these stairs.'
Visitors can explore the preserved tunnel galleries and tour an integrated museum dedicated to S.M.I.'s history, innovation, and industrial operations until the company closed in 2005. The exhibition showcases the company's pioneering workplace safety rules from 1912, the futuristic industrial village planning, and the engineering behind the shelter construction.
The shelters featured distinctive ogive-shaped entrances that provided indestructible access points from the surface, combined with various technical devices designed to rapidly evacuate all workers and their families from the factory-village in a very short time. This engineering allowed the entire workforce to reach safety efficiently during air raids.
Beyond their military importance, the S.M.I. shelters represent a remarkable example of industrial foresight and worker protection, featuring ultra-modern safety innovations from 1912 onwards that were revolutionary for their era. The site documents how a private company integrated advanced engineering, comprehensive worker welfare, and forward-thinking urban planning into a complete factory-village complex that operated successfully for nearly a century.