The band received responses to their first post "within hours" which Hyde later described as "an incredibly empowering moment, when we realized that there [are] more than the traditional ways of communicating.

[3] More than 200 tracks of newly recorded material proved hard to contain, so Hyde and Smith asked for the opinions of DJ and production friends including Pete Heller, James Holden, Darren Price, the Junior Boy's Own head Steven Hall, and Sven Väth.

It also included a gallery of selected 177 black-and-white photographs by Karl Hyde, and a PDF file with a front cover artwork for a CD insert.

[7] The second EP, Pizza for Eggs, codenamed "Riverrun 04," was released online on 7 December 2005 (2005-12-07),[8] with six new tracks as a single 25-minute 8-second piece.

[3] The third EP entitled I'm a Big Sister, and I'm a Girl, and I'm a Princess, and This Is My Horse, codenamed "Riverrun 05," was released on 5 June 2006 (2006-06-05).

[9] It "explores a darker, moodier side to Underworld", with the audio section being made from 5 new tracks jammed together to form a single work.

[3] A series of four limited edition 12-inch records, which included remixes of "JAL to Tokyo", "Play Pig", "Peggy Sussed", and "Vanilla Monkey" by Pete Heller, Buick Project, Pig & Dan, Wighnomy, Paul Woolford, and Martinez were released in 2006 at the end of the project.