Each of the three camera system is made up of three 30cm by 30 cm boxes that are camouflaged by their grey colour against the dimly lit tunnel walls.

每一种都有摄像系统是由三个30厘米宽，30厘米高盒的颜色是灰色掩藏与灯光昏暗的隧道壁。

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Each of the three camera system is made up of three 30cm by 30 cm boxes that are camouflaged by their grey colour against the dimly lit tunnel walls.

每一种都有摄像系统是由三个30厘米宽，30厘米高盒的颜色是灰色掩藏与灯光昏暗的隧道壁。

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