I saw a Program where they demonstrated "Noodlin".
Two men sank a hollowed out stump in a narrow area of lake 4 feet deep.They came back later to see if a Giant catfish had claimed the stump it's home.
One man stood up in the water and crouched down to insert his entire hand and arm into the stump,and see if anything grabs onto it..You watch the mans face as half his arm gets taken into the Catfish's mouth.
He calls out "He took it!"..and the struggle of endurance begins.
The man in the boat offers assisitance if he needs it,but otherwise it is one man,standing in 4 feet of water,trying to land that catfish into the boat under his own strength and stamina.It can go on for a very long agonizing period,as you have to pull him out of the stump with your arm in his mouth,the put your other arm around it and lift it out of the water and onto the boat.
As Ken mentioned,sometimes you better pray you are stronger then the Catfish,or he'll take you under.