Jerry, George, Elaine and Kramer go along on the expedition, get lost and are taken prisoner by illegal Chinese immigrants who are living secretly in sewer villages under the streets of New York's Chinatown. Kramer befriends them by teaching them some of his stir fry worm dishes and then makes a deal for their escape with the underworld leader by cutting him in on the worm profits. That's their instinct. Jerry opens the door of his apartment and is greeted with the smell of 2000 dead worms. He screams and is violently sick to his stomach.
Dead worms smell like cadavers.