The Internet's most dangerous sites

Some things just shouldn't be connected to the Internet. With Shodan, a search engine that finds connected devices, it's easy to locate dangerous things that anyone can access without so much as a username or password.

A swimming pool acid pump

hack pool
Are you sure you want to get in the pool?

Swimming pools have acid pumps to adjust the pH balance of the water. They're usually not connected to the Internet.

At least one of them is, though. So, exactly how powerful and toxic is this acid pump?

"Can we turn people into soup?" wondered Tentler.

Tentler said there was no distinguishing text in this app to tip him off to where the pool was located or whom it is owned by, so the owners haven't been contacted. Enter at your own risk!

- Last updated May 02 2013 09:52 AM ET