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Abstract: The C2 Contract of HS2 covers the route from North Portal of Chiltern Tunnels to Brackley and passes through the ancient woodland Sheephouse Wood. This site of special scientific interest includes large colonies of the rare and protected Bechstein’s bat. Design aspects of UK's largest-ever porous-tunnel structure (~900m long) to protect the bats from high-speed trains running at 360km/h, the...