Hmmmm sewage treatment! Always a problem, usually as the article says for inappropriate items being flushed away.
I remember one UK warship, when operating off the US coast had one such blockage. A stoker found his way down to an access point in one of the messdecks.
'scuse me lads, I've just got to do some work here'
'No worries shipmate..crack on!'
Stoker starts undoing inspection point to sound of hissing.................................
BANG!....................................The pipe explodes and showers urine and feaces over the entire messdeck, covering bunks, lockers, seats, towels and the unfortunates who happened to be sat there or asleep.
The whole messdeck had to be ripped out including all the fittings, tiled floor the lot.
The worst vision was watching some of the poor unfortunates on the Foc'sle stirring their valuable clothing items in an oil drum full of dis-infectant!
I feel the GWB's pain!!!!