Request cable bury?

We have a large cable in the corner of the backyard that I don't know what to do with.  Can you bury it?  Our landscape contractor said it was the internet for the whole neighborhood.  Don't know if it's true but the other end of the cable has some sort of in-line doodad that looks important.

Also, on the line running to our house, there is a short span that needs to be buried that's coming out of the bottom of the pedestal box. 

Thanks!