I stumbled upon a YouTube video showing that actual partial removal of a ground rod (about 4 feet of an 8 foot length, using about 9000 amps over several seconds being fed into the attached grounding wire. The video was recording part of a stress-to-complete-failure grounding test. Unfortunately I didn't bookmark it, so can't leave a citation. The voice-over included "We have ignition - and liftoff!" The ground around the rod was heaving up & down like waves on the sea. Most energetic and dramatic!