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  2. List of deepest mines - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_mines

    This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.

  3. Mines on the first day of the Somme - Wikipedia

    en.wikipedia.org/wiki/Mines_on_the_first_day_of...

    The joint explosion of these mines ranks among the largest artificial non-nuclear explosions. Eight big and eleven tiny charges were buried deep in the chalky earth to make up the 19 mines. They were "overcharged" to throw up high lips for screening and to give advantage to the attackers if they were able to capture the resulting craters. [1]

  4. Mines in the Battle of Messines (1917) - Wikipedia

    en.wikipedia.org/wiki/Mines_in_the_Battle_of...

    Several underground explosive charges were fired during the First World War at the start of the Battle of Messines (7–14 June 1917).The battle was fought by the British Second Army (General Sir Herbert Plumer) and the German 4th Army (General Friedrich Sixt von Armin) near Mesen (Messines in French, also used in English and German) in Belgian West Flanders.

  5. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]

  6. Underground hard-rock mining - Wikipedia

    en.wikipedia.org/wiki/Underground_hard-rock_mining

    The deepest active hard rock mine in North America is Kidd Mine in Canada, which mines zinc and copper in Timmins, Ontario. At the maximum depth of 9,889 feet (3,014 m) this mine is the deepest base metal mine in the world, and its low surface elevation means that the bottom of the mine is the deepest accessible non-marine point on earth. [14] [15]

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  8. World War I - Wikipedia

    en.wikipedia.org/wiki/World_War_I

    Instead, the French cabinet ordered its Army to withdraw 10 km behind the German frontier, to avoid provoking war. On 2 August, Germany occupied Luxembourg and exchanged fire with French units when German patrols entered French territory; on 3 August, they declared war on France and demanded free passage across Belgium, which was refused.

  9. Jeddo Tunnel - Wikipedia

    en.wikipedia.org/wiki/Jeddo_Tunnel

    The Jeddo Tunnel (also called the Jeddo Mine Tunnel [2]) is a drainage tunnel at water level in Pennsylvania. It is one of the Coal Region 's biggest discharges of mine water. [ 3 ] [ 4 ] The tunnel is five miles (eight kilometers) long and was constructed between 1891 and 1894, and at the time of its construction, was reputed to be the largest ...