One of the many machines I look after is a thing called an Ensilor (we have several). It has an approx 1200 litre vat that dead Salmon & formic acid are minced up to produce a slurry type of waste. The propeller shaft has bearings that collapse about every year rendering the propeller/mincer inoperative , usually persons continue to fill it to the top! 😎
Then the Engineer (me) has to withdraw the whole assembly to refit new taper rollers to the shaft (Yay!!). The first one I did had been formenting for 10 months plus , pandora’s box holds nothing as foul!
Black oozing bubbling putrid high protein greasy nastyness , the likes you never want to encounter. It doesn’t phase me slightly these days. 😁