Aeroplane Mode in Void

Put your device in 'aeroplane' mode (e.g. where no trace of signal leaves it) by turning off Wi-Fi and blue-tooth.

sudo sv stop wpa_supplicant bluetoothd

Find your device's name with ip a. If unsure, try this:

name=$(ip a | grep -Eo 'wlp\w{3}')

echo $name

Then set that device down:

sudo ip link set $name down