Moisture leaking out of chip in floor tile
I think your cracking the floor is a blessing in disguise.  Clearly there is water under the tile that needs to be dealt with.  

I'd start by checking the obvious things like the toilet seal and the bathtub and/or shower drains.

But ultimately you're going to want to pull that tile up, dry it out thoroughly, replace any water-damaged materials, and replace the flooring.  There is no way it will dry out on its own at this point.