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Completely agree with this, the amount of Soviet preparation was probably the defining feature of the battle. They dug defences *twenty miles* deep for the first line, with further lines behind extending the total depth of the defences to 190 miles.
From Wikipedia: Red Army combat engineers laid 503,663 anti-tank mines and 439,348 anti-personnel mines, with the highest concentration in the first main defensive belt. More than 4,800 kilometres (3,000 mi) of trenches were dug, laid out in criss-cross pattern for ease of movement. The minefields at Kursk achieved densities of 1,700 anti-personnel and 1,500 anti-tank mines per kilometre, about four times the density used in the defence of Moscow.The 6th Guards Army of the Voronezh Front, spread out over nearly 64 kilometres (40 mi) of front, was protected by 69,688 anti-tank and 64,430 anti-personnel mines in its first defensive belt and another 20,200 anti-tank and 9,097 anti-personnel mines in its second defensive belt.
The Soviets knew the offensive was coming and started to bombard the German forces the night before the attack was actually launched. That the Germans still managed to penetrate about 25m through those kind of defences speaks very well for them too.