They were asking why the two deepest holes, despite being nowhere near each other, dug decades apart, are 99.3% of 12km and 99.5% of 12km respectively. Was BP symbolically honoring the russian scientists? Does the earth have an extremely uniform material property that happens to be at a very round number of km? Just a complete coincidence all around?

(I asked AI, and it says coincidence, since BP stopped drilling once they hit oil, and the russians stopped drilling once they hit some melty rock.)