Carrington Event https://en.wikipedia.org/wiki/Solar_storm_of_1859 https://en.wikipedia.org/wiki/Solar_storm_of_1859 "Telegraph systems all over Europe and Nor

Carrington Event https://en.wikipedia.org/wiki/Solar_storm_of_1859 https://en.wikipedia.org/wiki/Solar_storm_of_1859 "Telegraph systems all over Europe and North America failed, in some cases giving telegraph operators electric shocks.[13] Telegraph pylons threw sparks.[14] Some telegraph operators could continue to send and receive messages despite having disconnected their power supplies" - wiki article