People Dumped Vehicles in the Canal

Ever since the city started draining the canal, about 50 vehicles have been unearthed and pulled out. But what did they find that was so shocking when they went back to drain the canal in 2016?
Ever since the city started draining the canal, about 50 vehicles have been unearthed and pulled out. But what did they find that was so shocking when they went back to drain the canal in 2016?