My sister had a leak beside the foundation of her house for several years, and we finally fixed it the other day. When we dug it up to fix it finally, we found what seemed to be a large cavity under the foundation. I was worried that the leak (which was really bad for a really long time. I'm astounded that she didn't realize there was a leak sooner.) was causing a sinkhole. This was my solution to investigate the hole further.

I ran the pi headless & I used Motion as a webcam server. The webcam cost $0.02 off of eBay, and had free shipping. :) and it has the LEDs on it with adjustable brightness. I took it out of its casing.

Turns out the hole wasn't as bad a I thought. 
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