非常通報ボタン
ひじょうつうほうボタン
Emergency report button
監視カメラ作動中非常用押しボタン
かんしカメラさどうちゅうひじょうようおしボタン
Surveillance camera is in operation, for emergency use push the button.
In a tunnel, I suppose if there were an earthquake and the tunnel collapsed, then you could call for help.
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