Check out this post in the South Korea vibe:
South Korea developing graphite 'blackout bombs' to paralyse North's electrical grid
https://www.yahoo.com/newsroom/vibes/south-korea/v-50a3291a-1aa0-3389-b071-c23ae7c7394b_c-629d6357-e0fd-316b-8ace-1c014e1e774f_a-629d6357-e0fd-316b-8ace-1c014e1e774f