I grew up in a place called "Griffith" its in nsw australia (underbelly season 2)
the town water is supplied in the massive tanks on top of the hill
when i was in high school, they found a skeleton in the water tank,
as in completely decomposed over an estimated decade they think the body was in there
the funny thing is the water taps always had this white flakey discharge for like 4-5 years, we now know why
this was middle to late 1980s if i remember correctly, i was in high school and my mother still lives less than 2 kms from those water tanks lol
the police stated he was definately put in there, cause the access holes have about 50 bolts each on the outside, like 1 inch thick bolts lol