For those who were like me and were wondering the amount of damage cave-ins from level one dealt, here we go:
I was an idiot and decided to mine a random tile in a cave, and a cave-in happened. I saw a red "122" and thought it was HHP damage and i was dead, but don't worry, it just did a 12 damage concussion and a 19 damage blunt trauma, so cave-ins on level one are very mild.