The Tunnel is known for many things, not least of which are the illustrations that accompany--or interact with--the text. The materials related to The Tunnel in the William H. Gass Papers include folders full of, for example, Gass's illustrations, diagrams and designs for the Party of the Disappointed People and the tunnel system that the narrator William Kohler digs. Also of note are the different drafts of a humorous poem-cartoon that didn't make it into the final book.