How did the Sumerians differ from the Egyptians in the way they viewed an afterlife?

The Egyptians believed that if they recited the right incantations and pass all of the tests from the Book of the Dead, they would make it to their paradise, Happy Field of Food. The Sumerians however, believed when they died they would descend to the grim underworld, a point of no return.

The Sumerians believed at death, they were expected to descend forever into a dark underworld, a huge cave filled with nothing but dust and silence. As the textbook says, they had a gloomy outlook on aftterlife.