Core Here's one out of SciFi and comic books. This guy is serious though. David Stevenson of the CalTech proposes to blast a rift through the Earth's crust of several hundred metres in length and depth, and about 30 centimetres wide - probably using a nuclear device. He would then send probes down the fissure to study the Earth's core. I'm not sure about you, but isn't invasive experimentation a thing of the past? And should we really be cutting up lab-rat-Earth to see how it works? This is akin to a flea deciding a really good idea would be to make a great gash into a dog to study how it works. Sound or not, I'm not for this.