Germain Sommeiller (February 15, 1815, in Saint-Jeoire – July 11, 1871) was an Italian

civil engineer A civil engineer is a person who practices civil engineering – the application of planning, designing, constructing, maintaining, and operating infrastructure while protecting the public and environmental health, as well as improving existing i ...

from

Savoy Savoy (; )  is a cultural-historical region in the Western Alps. Situated on the cultural boundary between Occitania and Piedmont, the area extends from Lake Geneva in the north to the Dauphiné in the south and west and to the Aosta Vall ...

. He directed the construction of the

Fréjus Rail Tunnel The Fréjus Rail Tunnel (also called Mont Cenis Tunnel) is a rail tunnel of length in the European Alps, carrying the Turin–Modane railway through Mont Cenis to an end-on connection with the Culoz–Modane railway and linking Bardonecc ...

between France and Italy, also known as the Mont Cenis Tunnel. This was the first of a series of major tunnels built in the late 19th century to connect northern and southern Europe through the

Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...

. Sommeiller pioneered the use of pneumatic drilling and

dynamite Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay), and Stabilizer (chemistry), stabilizers. It was invented by the Swedish people, Swedish chemist and engineer Alfred Nobel in Geesthacht, Northern German ...

to achieve record-breaking excavation speeds. This 13.7km tunnel was completed on 26 December 1870, 11 years ahead of schedule. It remained the longest tunnel in the world until the opening of the

Gotthard Rail Tunnel The Gotthard Tunnel (, ) is a railway tunnel that forms the summit of the Gotthard Railway in Switzerland. It connects Göschenen with Airolo and was the first tunnel through the Saint-Gotthard Massif in order to bypass the St Gotthard Pa ...

in 1882.

Life

Germain Sommeiller was born in Saint-Jeoire (now part of

Haute-Savoie Haute-Savoie () is a Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, region of Southeastern France, bordering both Switzerland and Italy. Its Prefectures in France, prefecture is Annecy. To the north is Lake Gene ...

, France) on 15 February 1815. He graduated in civil engineering at the

University of Turin The University of Turin (Italian language, Italian: ''Università degli Studi di Torino'', UNITO) is a public university, public research university in the city of Turin, in the Piedmont (Italy), Piedmont region of Italy. It is one of the List ...

in 1841. He became a Royal Civil Engineer in the Public Transport Department of Savoy in 1845. From 1846 to 1850 he worked for the Cockerill steel company in

Liège Liège ( ; ; ; ; ) is a City status in Belgium, city and Municipalities in Belgium, municipality of Wallonia, and the capital of the Liège Province, province of Liège, Belgium. The city is situated in the valley of the Meuse, in the east o ...

, which helped build the Belgian rail network. He met his future partner Sebastiano Grandis there. He then returned to Savoy as assistant to the Belgian engineer Henri Maus, who directed the construction of the

Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...

Genoa Genoa ( ; ; ) is a city in and the capital of the Italian region of Liguria, and the sixth-largest city in Italy. As of 2025, 563,947 people live within the city's administrative limits. While its metropolitan city has 818,651 inhabitan ...

railway. He was recognised for outstanding technical skills, so when king

Vittorio Emanuele II Victor Emmanuel II (; full name: ''Vittorio Emanuele Maria Alberto Eugenio Ferdinando Tommaso di House of Savoy, Savoia''; 14 March 1820 – 9 January 1878) was King of Sardinia (also informally known as Piedmont–Sardinia) from 23 March 1849 u ...

decided to build the Mont Cenis Tunnel between

Bardonecchia Bardonecchia (; ; , ) is an Italian town and ''comune'' located in the Metropolitan City of Turin, in the Piedmont region, in the western part of Susa Valley. It grew out of a small village with the works for the Fréjus Rail Tunnel, the first c ...

and

Modane Modane (; ) is a Communes of France, commune in the Savoie Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, region in southeastern France. The commune is in the Maurienne Valley, and it also belongs to the Vanoise ...

in 1857, Sommeiller was appointed head of design and construction. His collaborators were the Italian engineers Sebastiano Grandis and Severino Grattoni. He patented the pneumatic rock-drilling machine, used in the tunnelling works, based on the invention of Giovanni Battista Piatti.

Politics

When Savoy was

annexed Annexation, in international law, is the forcible acquisition and assertion of legal title over one state's territory by another state, usually following military occupation of the territory. In current international law, it is generally held to ...

to France in 1860, Someiller chose to become an Italian rather than a French citizen. He was subsequently elected a member of the first

Italian Parliament The Italian Parliament () is the national parliament of the Italy, Italian Republic. It is the representative body of Italian citizens and is the successor to the Parliament of the Kingdom of Sardinia (1848–1861), the Parliament of the Kingd ...

Death

Germain Sommeiller died in his native town of Saint-Jeoire on 11 July 1871, six months after the December 1870 completion of the tunnel.

Pointe Sommeiller Punta Sommeiller (in Italian) or Pointe Sommeiller (in French) is a mountain of the Province of Turin, Italy and of Savoie, France. It lies in the Cottian Alps range. It has an elevation of above sea level. Etymology The old name of the moun ...

, a 3332-metre-high peak in the

Cottian Alps The Cottian Alps (; ; ) are a mountain range in the southwestern part of the Alps. They form the border between France (Hautes-Alpes and Savoie) and Italy (Piedmont). The Fréjus Road Tunnel and Fréjus Rail Tunnel between Modane and Susa, Ital ...

, and Col Sommeiller, the nearby mountain pass linking

Bramans Bramans is a former commune in the Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. On 1 January 2017, it was merged into the new commune Val-Cenis.Bardonecchia Bardonecchia (; ; , ) is an Italian town and ''comune'' located in the Metropolitan City of Turin, in the Piedmont region, in the western part of Susa Valley. It grew out of a small village with the works for the Fréjus Rail Tunnel, the first c ...

, Italy, were named in his honour. Several streets in Savoy cities such as

Annecy Annecy ( , ; , also ) is the Prefectures in France, prefecture and List of communes in France with over 20,000 inhabitants, largest city of the Haute-Savoie Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, regi ...

also bear Sommeiller's name.

References

External links

Germain Sommeiller , Britannica
{{DEFAULTSORT:Sommeiller, Germain 1815 births 1871 deaths People from Haute-Savoie People from the Kingdom of Sardinia Deputies of Legislature V of the Kingdom of Sardinia Deputies of Legislature VII of the Kingdom of Sardinia Deputies of Legislature IX of the Kingdom of Italy Italian engineers Italian people in rail transport University of Turin alumni