Marvin, can you hear me? Marvin? Damn ... that's just the echo of my own voice. I was wondering why Marvin would be calling out to himself. Marvin!?
Right, so ... I think we went a little too far with the archaeological dig, particularly once we got Mitch Macaphee, our mad science advisor, and Marvin (my personal robot assistant) involved. At first it was just a lark - we took a shovel to the floor of the Cheney Hammer Mill's sub-basement just to see what we could find. Turns out there's a lot of dirt down there. (Little known fact: the Earth is largely composed of dirt. I suspect that's why "earth" is a synonym of "dirt".) Sure, we turned up our share of lost quarters, belt buckles, tie clips and fossilized coelacanths, but that was about it.
Then Mitch decided to get involved, and of course, all hell broke loose. That is to say, he used one of his patented Particle Beam Generators™ to burn a hole through the Earth's crust, clear down to the molten nickel core, which (as you know from watching television) is in a perpetual state of raging ferment - hell fire from beneath the ground, shall we say. To understand why this may have happened, you have to understand the scientific mind. Once you get that, imagine a diseased version of that same mind and you will have some insight into Mitch's reasoning.
Well now, this didn't go over very well, but I suggested to Mitch that his Particle Beam Generator™ had essentially blown the entire archaeological enterprise by incinerating every stratum between the mill floor and the Earth's core; hence, a thousand potential discoveries may have been irretrievably lost. His answer was to devise a crane-like device and lower someone (not him!) down into the newly-bored hole to have a look at the top layers that had been exposed. How did we decide on Marvin? Well, there's that ten bucks I owe him ... and of course, he is much better qualified for the mission than I am. So sure, we put him in a harness and lowered him down into the hole, like he was on a fishing rod.
Anyone who has seen the movie Crack in the World can picture what comes next: A big flame comes out of the hole ten minutes after Marvin took the plunge. Radio silence thus far, but no worries: it's Marvin's nap time right about now, so he would tend to be unresponsive anyway.