When a missile or a meteor hits the ground, we know how it looks, we can easily determine that it was indeed hit by a meteor or a missile. This thing cannot be said underground though. In fact, no one can tell what happens underground when a missile hits.
In an effort to find the answer to it, physicists at Duke University tried to simulate it. They created an artificial soil and sand in the lab then simulated the high-speed impact of a meteor on their artificial soil. They used a close up camera in slow motion to capture the impact.