During tunnel excavation operations, specialized systems are used to manage telephony and alarms of various levels.

The base station mounted in the tunnel with an interdistance of 300-500 meters includes an IP66 industrial telephone that allows outside calls, equipped with an optical and acoustic call signal which guarantees the reception of calls even with high ambient noise.

An electrical panel with some alarm buttons allows the start of the emergency procedures, step by step, up to the evacuation. For this, flashing lights and sirens are installed, whose operation is defined in the relative safety protocol.