When you look at landscapes with different eyes you will see more than just a mountain you will see this was once a giant building and the aftermath left rock, soil, sand, clay and stone all substances produced from altered states of matter and the soil and sand was brick ash just like you get ash in a wood fire or charcoal fire the ashes of of the meltdown is soil and sand hence why after the flood the flooding mixed with the brick ash that caused most buildings to be submerged in mud hence mud flooding because so many of the survived buildings were all sunken in this mud or brick ash a couple of stories in depth or even more because these buildings could be so tall and most is buried hence the discoveries of tunnels but could be melted remnants of these sunken brick flooded buildings