The Tunguska body carried the punch of a 5-megaton bomb, yet dug no crater. What explains that?

1. A crater needs the incoming body to reach the ground still in one piece. 2. The Tunguska object was stony and weighed roughly 10,000 tons. 3. Air pressure shattered it about 8 kilometers above the surface. 4. Only heat and shock reached the ground, so no pit was excavated. 5. The blast still flattened more than a thousand square kilometers of forest. 6. Siberia is dry land, so a deep ocean basin was never involved. 7. At about 40 meters across the body was large enough to dig a crater had it survived. 8. Angle does not matter here, since impact craters come out circular at any approach angle. _Source: OpenStax Astronomy (CC BY 4.0), section 8.5 Cosmic Influences on the Evolution of Earth_