The science behind getting stuck in mud

[Lightsyn]

Hey guys ! :)
Last week I went on a Trip to this place 3500 ft above sea level, as I was walking my rubber boots got stuck on a big pile of mud (almost 30 to 40 cm) of my boots. I managed to take one out but the other was so stuck I had to play the natives to help me get it out.
So my question is, why was it hard to take it out?
What is that phenomena called?
Under what topic can I get more info about it?
Greets ^^

 

[anorlunda]

That is certainly an unusual physícs question. I think the name of the phenomonon is suction. Can you figure out the rest yourself?

 

[Sky Blue]

it is an issue of displacement and pressure, all things must be equal.

 

[CWatters]

It's probably not this simple but... compare your boot with a sink plunger or large rubber sucker. What holds those in place is air pressure. I the case of your boot the mud forms a pretty good seal around it. Have a think about air pressure and the surface area of your footprint.