A network isolation device includes an internal network interface to connect the network isolation device to an internal network and an external network interface to connect the network isolation device to an external network. The network isolation device further includes an airgap device that operates to (i) close an air gap to connect the internal network to the external network, (ii) open the air gap to disconnect the internal network from the external network. The device further includes a signal receiver that receives a signal from a signal source, and based on the signal, performs an authentication process to determine whether the signal or the signal source are authorized. In response to determining that the signal or the signal source is authorized, the receiver operates the airgap device to close the air gap and connect the internal network to the external network.