They look like short, fat silos. The sides are very steep and slippery, making it impossible for you to climb out of the tank. Slurry storage tanks have a ladder on the outside which leads to the top of the structure. You should never play or climb up on the ladder. Liquid manure can also be stored in lagoons .
Many people mistake a lagoon for a pond because they look very similar.
The danger with a lagoon is the manure creates a crust on the top that may appear safe. If you were to walk across the top, the weight of your body will cause the crust to break. There is not much of a chance you could survive in the heavy manure. Grain drowning is a common type of solid drowning which can occur on farms. Small grains like corn, soybeans and wheat are stored in grain bins and gravity wagons.