Portland, Oregon (CNN) - An Oregon woman and her dog fell into this 20-foot-deep sinkhole.
Take a look inside.
Officials say the woman fell while searching for her dog in the dark Tuesday night.
Earlier, the dog had fallen into the hole.
A passerby heard the woman screaming for help and called 911.
A heavy rescue unit used a rope and ladder to save them.
Once above the ground, crews determined the woman and her dog were not hurt.
It is not clear how the sinkhole formed.