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Tunnels have run under Gaza for decades. But when Hamas took over, the underground network expanded into what Israel calls its biggest military threat. We decoded the long history of the Gaza tunnels to find out what makes it so hard to destroy.

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Russian military cadets take part in a rehearsal for the Victory Day parade on Dvortsovaya Square in Saint Petersburg on April 25, 2023.
Russian military cadets take part in a rehearsal for the Victory Day parade on Dvortsovaya Square in Saint Petersburg on April 25, 2023.
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Two Ukrainian soldiers clear mines and a warning sign about mines.
Soldiers prepare to clear an anti tank mine by using rope to remove the detonator during a mine clearance training exercise on July 11 2023, in Zaporizhzhia region, Ukraine; Unexploded munition collected by de-mining unit of National Guards of Ukraine before they will be destroyed seen in near Kherson.
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Wounded Ukrainian soldiers at Zaporizhzhia Military Hospital
Soldiers recovering from their wounds are pictured at the Zaporizhzhia Military Hospital, Zaporizhzhia, southeastern Ukraine.
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Ukrainian soldiers help a wounded comrade into an evacuation vehicle in the frontline in Bakhmut, Donetsk region, Ukraine, Monday, Feb. 20, 2023.
Ukrainian soldiers help a wounded comrade into an evacuation vehicle in the frontline in Bakhmut, Donetsk region, Ukraine, Monday, Feb. 20, 2023.
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Ukrainian servicemen carry a coffin of one of the three Ukrainian soldiers killed during the battles with Russian troops.
While Ukraine does not disclose the number of casualties it has sustained, General Mark A. Milley, the chairman of the Joint Chiefs of Staff, estimated in February that Ukraine had lost more than 100,000 soldiers since the war began last year.
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Russian military
Russian servicemen patrol the destroyed part of the Ilyich Iron and Steel Works in Ukraine's port city of Mariupol on May 18, 2022, amid the ongoing Russian military action in Ukraine.
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A Ukrainian service member fires a mortar towards Russian troops in frontline near the Vuhledar town, amid Russia's attack on Ukraine, in Donetsk region, Ukraine February 7, 2023
A Ukrainian service member fires a mortar towards Russian troops in frontline near the Vuhledar town, amid Russia's attack on Ukraine, in Donetsk region, Ukraine February 7, 2023
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A collage of five photographs showing scenes from the war in Ukraine