Marvin Robinson digs up a part of an ice field and swims in chilled water below it in Fort Dodge, Iowa.

Swimmer Marvin Nelson swims in Fort Dodge , Iowa. Marvin Nelson digs up the surface of an ice field. He takes off his clothes. He gets into the water below the ice cover. He swims in chilled water and catches a fish. He gets out from the ditch in the ice field.