My one memory of the Secchi disk was when I took Earth Science during summer school one year. We went to a park by the bay and one of my classmates slowly lower

My one memory of the Secchi disk was when I took Earth Science during summer school one year. We went to a park by the bay and one of my classmates slowly lowered it into some murky water. He then proceeded to drop it in the river. The poor teacher had to get down to his skivvies and retreive it!