On a related note,In 1976,our family rented a houseboat on a lake for a week.We were a big Camping family,and thought we'd try something different.
It was in a HUGE flooded quarry in Indiana somewhere I recall,where exactly today I don't know,but wish I did & could find it again to re-live my youth.
Anyway,after they give you a tutorial of how the boat works,you have free reign of the lake,and all the lakes connected to it for 7 days.
We sailed around all week and laid anchor for awhile to fish & swim,then weigh anchor and move on.It was great fun & an experience at the age of 12.
One day Dad dropped the anchor,and when we went to pull it up,it didn't let go...caught on something on the bottom.
Dad unraveled all the anchor line,(Damn if he was going to pay for a new 100' long nylon rope),then tied a boat buoy to the end of it.We high tailed it back to the dock,and told the rental company what happened.They said it's probably snagged on a tree,as this quarry is full of them.
So Dad,me & one of their strongest employees headed back to the anchor in a speed boat,as Mom & my sisters stayed on the housboat the dock.
When we attached the line to the speedboat,he threw it in high gear and spun around,hoping to release the anchor from whatever was holding it..Tons of mud stirred up,water came sloshing in to the speedboat as it was pulled under,but no anchor..The guy said they usuaully release by now,so repeated his efforts.
We did this same routine for about an hour,before the anchor line finally released and was free.As I pulled the line up while the guy drove the boat,there was a large piece of metal hanging on one side of the anchor,that clearly was man made.It looked to be a piece of curved pipe with a trigger on the end.As we were heading back to the dock,the rough neck said it looks to be a gasoline nozzle.Said people have been dumping ***** in this lake for decades,and it was probably a gas pump down there.Said when the Houseboat rental re-aligned with a different oil Co. to pump their brand of gas on the dock,they probably removed the old pumps and dumped them out in the middle of the lake.
Said the odds of us spread over the miles of that lake finding a gas pump had to be a million to one shot.
They noted it on their map back @ the dock where it was for future reference.
I was told decades ago that HouseBoat quarry doesn't exist anymore as it dryed up.
Wish I could go back there again.It was a bout a 1/2 days driving distance from Chicago is all I recall,as we were Home fairly fast.