1st Australian Tunnelling Company
A First World War Australian military engineering unit that conducted underground mining, counter-mining, construction, and defensive works on the Western Front.
Last updated August 26, 2026
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Overview
The 1st Australian Tunnelling Company was a specialist military engineering unit of the Royal Australian Engineers during the First World War. Its work centred on underground warfare on the Western Front, where armies constructed mines beneath opposing trenches, attempted to detect and destroy enemy galleries, and built subterranean infrastructure for communications, medical support, troop accommodation, and logistics. The company emerged from the Australian Mining Corps, a battalion-sized formation assembled in 1915 from Australian soldiers with civilian mining experience. The original plan was to use the corps with the Australian and New Zealand Army Corps at Gallipoli, but that deployment did not occur. Instead, the Australian Mining Corps moved to France in May 1916. Soon after its arrival in Europe, it was divided into three tunnelling companies and one electrical, mechanical, boring, and mining repairs company; the corps headquarters was then dissolved. The 1st Australian Tunnelling Company became one of the Australian units assigned to the British Expeditionary Force's extensive underground operations. The company first took over work in the Railway Wood, Hooge, and Armagh Wood sector of the Ypres Salient in May 1916, relieving the British 175th Tunnelling Company. In November it assumed responsibility for important mine workings beneath Hill 60 and the Caterpillar near Messines from Canadian tunnelling units. These galleries were part of a large British, Canadian, and Australian mining system prepared for the Battle of Messines in June 1917. The company's assignment was both offensive and defensive. Its personnel had to preserve and maintain large explosive charges beneath German positions while preventing German miners from discovering or destroying them. Work in the difficult blue clay required drainage and ventilation shafts, and tunnels near the railway were vulnerable to collapse. Soldiers also operated shallow listening posts to identify German underground activity and dug counter-tunnels to intercept enemy excavations. Bombardment, cave-ins, underground explosions, and enemy counter-mining made the work exceptionally hazardous. A German raid in April 1917 failed to locate the entrances to the British galleries, but a detonator explosion in the Australian underground headquarters on 25 April killed ten men. Approximately thirty Australian tunnellers are estimated to have died in the Hill 60 operations. The mines were detonated on 7 June 1917 at the opening of the Battle of Messines, producing nineteen major craters and helping create the conditions for the Allied assault. The 1st Australian Tunnelling Company also worked on the Catacombs beneath Hill 63 at Ploegsteert, another major underground defensive and accommodation complex. The unit's wartime legacy is commemorated at the Hill 60 Battlefield Memorial Park near Zillebeke. A memorial first erected by the tunnellers in 1919 was replaced by a permanent monument inaugurated in 1923. The company later became widely known outside military history through Beneath Hill 60, a 2010 Australian film based on the experiences of the unit and the wartime account associated with Captain Oliver Woodward. The company was a wartime military formation rather than a commercial brand, and it no longer operates.
History
Underground warfare became a significant feature of the Western Front after the British Expeditionary Force recognised in early 1915 that German forces were developing systematic mining operations. British authorities had not prepared adequate counter-mining methods or underground listening equipment before the war. Following discussions involving Brigadier George Fowke and mining specialist John Norton-Griffiths, the War Office approved the tunnelling-company system on 19 February 1915. The first British tunnelling companies were formed largely with experienced coal miners and were deployed to areas such as Hooge, Hill 60, Railway Wood, Sanctuary Wood, St Eloi, and The Bluff. Their duties included placing mines under enemy positions, detecting German galleries, constructing counter-mines, and creating underground shelters and communications routes. The success of the early units led to underground mining becoming a distinct branch within the Engineer-in-Chief's organisation. Additional companies were formed during 1915 and 1916, eventually creating a broad multinational tunnelling capability on the Western Front. On 10 September 1915, the British government appealed to the Dominions to provide tunnelling companies. Australia responded by assembling the Australian Mining Corps from soldiers with civilian mining backgrounds. While the corps was initially intended for service at Gallipoli, it was transferred to France in May 1916. There, the battalion-sized formation was reorganised into three specialist tunnelling companies and a separate electrical, mechanical boring, and mining repairs company. The corps headquarters was dissolved, and the 1st Australian Tunnelling Company began operations as an independent specialist unit within the British-controlled mining system. In May 1916 the company relieved the British 175th Tunnelling Company in the Railway Wood, Hooge, and Armagh Wood sector of the Ypres Salient. On 7 November it took over the Hill 60 mine workings from Canadian units. The Hill 60 system included two major charged mines: one beneath Hill 60 containing approximately 53,000 pounds of ammonal and another beneath the Caterpillar containing approximately 70,000 pounds. The galleries had been developed by successive British, Canadian, and Australian tunnelling units as part of the preparations for the Battle of Messines. For approximately seven months the Australians were responsible for keeping the explosives secure and the galleries operational. They excavated drainage and ventilation shafts through difficult blue clay, reinforced sections threatened by collapse, maintained listening posts, and dug counter-tunnels toward German workings. German miners continually attempted to locate the British system. A German infantry raid in April 1917 sought the entrances but did not find them. The danger remained severe: a detonator explosion in the underground Australian headquarters on 25 April killed ten men, while cave-ins, bombardment, and mining incidents caused further casualties. Around thirty Australian tunnellers are estimated to have been killed in the Hill 60 operations. On 7 June 1917 the Messines mines were fired as the British attack began. The explosions produced nineteen large craters and marked one of the largest coordinated mining operations of the war. The 1st Australian Tunnelling Company also contributed to work at the Catacombs beneath Hill 63 at Ploegsteert, an underground complex used for shelter and military support. The company's surviving legacy is represented by the Hill 60 memorial near Zillebeke. Its first memorial was erected by the tunnellers in 1919, and a replacement monument was inaugurated in 1923. The unit's history was subsequently popularised by the 2010 Australian film Beneath Hill 60, directed by Jeremy Sims and written by David Roach. The film portrays the company's wartime experience through the story of Captain Oliver Woodward. As a wartime military unit, the company was not a commercial enterprise and is now defunct.
- 1923
Permanent memorial inaugurated
[1]A replacement memorial was inaugurated at the Hill 60 Battlefield Memorial Park near Zillebeke.
- 1919
First Hill 60 memorial erected
[1]The company's former members erected an initial memorial at Hill 60.
- 1917
Underground headquarters explosion
[1]A detonator exploded in the company's underground headquarters on 25 April, killing ten men.
- 1917
Messines mines detonated
[1]The Hill 60 and Caterpillar mines were fired on 7 June at the start of the Battle of Messines.
- 1916
Australian Mining Corps arrives in France
[1]The Australian Mining Corps moved to France in May and was divided into three tunnelling companies and one repairs company.
- 1916
Operations begin at Hooge and Railway Wood
[1]The 1st Australian Tunnelling Company relieved the British 175th Tunnelling Company in the Railway Wood, Hooge, and Armagh Wood area of the Ypres Salient.
- 1916
Hill 60 mines transferred to the company
[1]On 7 November, the company assumed responsibility for the Hill 60 and Caterpillar mines from Canadian tunnelling units.
- 1915
Australian Mining Corps assembled
[1]A battalion-sized Australian mining formation was assembled from personnel with civilian mining experience, initially with possible service at Gallipoli in mind.
Products and positioning
A specialist Australian military engineering formation focused on underground offensive and defensive operations during the First World War.
Military engineering · 1916
Offensive mine galleries
The company maintained and protected underground galleries used to place large explosive charges beneath German positions. Its work formed part of the interconnected mine system prepared for the Battle of Messines, including the workings beneath Hill 60 and the Caterpillar.
Military engineering · 1916
Counter-mining and underground listening
Tunnellers operated listening posts and excavated counter-tunnels to detect, intercept, and destroy German underground works. These operations required constant monitoring because enemy galleries, bombardment, and unstable ground could threaten the main mine system.
Military engineering · 1916
Subterranean military infrastructure
The unit built or maintained drainage and ventilation shafts, deep dugouts, subways, saps, cable trenches, and underground chambers used for signals, medical services, and troop accommodation. It also worked on the Catacombs beneath Hill 63 at Ploegsteert.
Marketing campaigns
- 1917Battle of Messines mine preparations
Belgium
The company protected and maintained the charged mine galleries beneath Hill 60 and the Caterpillar while conducting ventilation, drainage, listening, and counter-mining work.
Outcome. The mines were detonated on 7 June 1917 and contributed to the opening assault at Messines, creating nineteen large craters.
- 1917Hill 63 Catacombs work
Belgium
The company undertook underground work on the Catacombs inside Hill 63 at Ploegsteert.
Outcome. The Catacombs formed part of the broader subterranean shelter and support network used on the Western Front.
- 1916Ypres Salient underground operations
Belgium
After arriving on the Western Front, the company relieved a British tunnelling unit in the Railway Wood, Hooge, and Armagh Wood area and undertook underground offensive and defensive engineering.
Outcome. The company became established as an Australian specialist unit in the Ypres underground war.
Brand decisions
1916
Reorganisation into specialist tunnelling companiesStrategyBackground
The Australian Mining Corps was transferred to France rather than employed at Gallipoli, where the need for underground warfare support was greater.
Action taken
After arriving in May 1916, the corps was divided into three tunnelling companies and one electrical, mechanical boring, and mining repairs company, with the corps headquarters dissolved.
Aftermath
The reorganisation created the 1st Australian Tunnelling Company as a specialist unit operating within the Western Front mining system.
1916
Transfer of Hill 60 mine responsibilitiesOtherBackground
The Hill 60 and Caterpillar mines had been developed and charged through cooperation among British and Canadian tunnelling units.
Action taken
On 7 November 1916, the 1st Australian Tunnelling Company took over the mine workings from the 1st and 3rd Canadian Tunnelling Companies.
Aftermath
The Australians spent the following months preserving the galleries and charges against collapse and German counter-mining until the Messines attack.
Sources2 sources
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