Trap in drainage

Got trapped while growing up, it was a scary scene, it happened on a Sunday afternoon after we back from Church, while playing football in a pitch close to the house my ball fall into the drainage and it was dip but I didn't border because I had to get it out, while trying to reach out to my ball I fell inside the drainage, unknowing there was mud in it, I started sinking after a while, I started screaming for help.

I got lucky after some minutes of sinking in the mud, a passer by heard my voice and came to my rescue.