We have many underwater hazards here on the Mohawk river,upstate NY. Model T autos from many years ago, washers, tv's, bicycles, shopping carts, riprap near the locks and other..
We had a hurricane back in 2011 that added more to the hazards. Trees, cement tubes..6ft dia x 10ft long that were washed into the river when the flood water bypassed the locks on the sides.
...hence the needed "rope" to fetch our expensive lures..hopefully just needing hooks..