This house was left empty for over 18 months. The pipes to the shower and sink are run through external walls with no lagging or insulation, also, the pipes were CPVC, which does not react well to freezing). The freezing temperatures during the 2013 and 2014 winters, caused spider cracks in CPVC pipes; in one case, the water in the pipe froze and expanded, causing the pipe to literally explode.
The resulting pool of water caused black mold and rotted all the way through the floor board. The moisture attracted termites (even after a whole house treatment in 2012) which eat through the wood causing the structural supporting 2x4s to become spongelike and soak up even more water.
By the start of this video the black mold has been cleared using a bleach and water solution and the rotten floorboard and structural support have been removed.