This brings memories of seeing the outcome of what was believed to be a cleaner's mop catching a pipe on a QANTAS A380.
QF94 was traveling from Los Angeles to Melbourne when a water pipe became detached, flooding the upper deck and causing waterfalls onto those on the lower deck. It struck a chord with me as I was doing galley certification at the time and had raised a concern about an oversize waste water hose which would not seal. After emailing the photos of the A380 flood to our quality department, they told me I was being alarmist.
The Aviation Herald - A380 Cabin flood, QF94 2 July 2014