At 70 miles, I think you would have been incinerated. At 700 miles, you probably would have felt a lot of heat and maybe the shock wave.
I’m glad I wasn’t there. ☺
One of the largest craters in our Solar System is on the Moon weighing in at about 1,500 miles in diameter and 8 miles deep.
According to recent reports it may contain an enormous chunk of metal allegedly larger than Hawaii’s Big Island.