A chunk of ice fell out of the sky and left a huge hole in the ground at Oakland's Bushrod Park.
From the website:
Jacek Purat saved a piece of ice chunk that originally measured three feet in diameter. He says it came out of the southwestern sky, slammed into the ground along Shattuk Avenue and exploded into pieces. ...
It burrowed about two-and-a-half feet into the ground, where Oakland firefighters retrieved it. ...
ABC7 aviation expert Ron Wilson believes the only possible way it could have come from an airplane is if the plane's valve for fresh water leaked at a high elevation. ...
The other possibility is that it is a chunk of ice from space.