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Directed by | |||
| Stephen Judson | (as Steve Judson) | ||
Writing credits(in alphabetical order) | ||
| Jack Stephens | ||
| Steve Atteberry | ... | Himself - Caver | |
| Nancy Holler Aulenbach | ... | Herself | |
| Hazel Barton | ... | Herself | |
| Gordon Brown | ... | Himself | |
| Marty Brown | ... | Himself - Caver | |
| Mark Clippinger | ... | Himself - Caver | |
| Scott Davis | ... | Himself - Caver | |
| Scott Dawson | ... | Himself - U.C. Berkeley (as Scott Dawson Ph.D.) | |
| José R. de la Torre | ... | Himself - U.C. Berkeley (as José R. de la Torre Ph.D.) | |
| Sam Drevo | ... | Himself | |
| Jorge Gonzalez | ... | Himself | |
| Steffen Heim | ... | Himself - U.C. Berkeley (as Steffen Heim Ph.D.) | |
| Kevin Higgins | ... | Himself - Caver | |
| Rebecca Holden | ... | Herself - Caver | |
| Janot Lamberton | ... | Herself | |
| Mael Lamberton | ... | Himself | |
| Rebecca Middleton | ... | Herself - U.C. Berkeley | |
| Luc Moreau | ... | Himself | |
| Liam Neeson | ... | Himself - Narrator (voice) | |
| Rueben Novelo | ... | Himself | |
| Carolyn Rasmussen | ... | Herself - U.C. Berkeley | |
| George Stowe-Raines | ... | Himself - Caver | |
| Denver West | ... | Himself - Caver | |
| Margaret Zupancic | ... | Herself - U.C. Berkeley |
Produced by | |||
| Michael J. Cudahy | .... | executive producer | |
| Stephen Judson | .... | producer (as Steve Judson) | |
| Alec Lorimore | .... | producer | |
| Greg MacGillivray | .... | producer | |
Original Music by | |||
| Graeme Edge | |||
| Daniel May | |||
| Ray Thomas | |||
| Steve Wood | |||
Cinematography by | |||
| Brad Ohlund | (director of photography) | ||
Film Editing by | |||
| Stephen Judson | |||
Art Direction by | |||
| John Riggs | |||
Production Management | |||
| Cris Andrei | .... | production manager | |
| Len Bucko | .... | production manager | |
| Josh Colover | .... | production manager (as Joshua Colover) | |
| Arturo Del Rio | .... | production manager: Mexico | |
| David Frost | .... | production manager | |
| Earl Wiggins | .... | unit production manager | |
Sound Department | |||
| Paul Curtis | .... | dialogue editor | |
| Andrew DeCristofaro | .... | sound effects designer | |
| Marshall Garlington | .... | sound | |
| David Myslek | .... | sound editor | |
| Michael Orlowski | .... | sound effects editor | |
| Aaron Rihel | .... | sound recordist | |
| Martin Schloemer | .... | sound recordist | |
| Ann Scibelli | .... | sound effects editor: EFX Systems (as Anne Scibelli) | |
| Dan Scolnik | .... | foley cue | |
| Dan Scolnik | .... | foley editor | |
| Bob Stewart | .... | additional dialog editor | |
| Ken Teaney | .... | sound mixer: Wilshire Stages | |
| David Abrahamsen | .... | sound editor (uncredited) | |
Visual Effects by | |||
| Daniel Rapo | .... | scanning & film recording | |
Editorial Department | |||
| Charlie Fuguet | .... | post-production consultant: DKP 70MM Inc. | |
| Craig Edward Rogers Jr. | .... | post-production assistant | |
Other crew | |||
| Kit Anderson | .... | collaboration and contribution: Cincinnati Museum Center | |
| Karol Bartlett | .... | science advisor | |
| Hazel Barton | .... | science advisor (as Dr. Hazel Barton) | |
| Jacqueline Belwood | .... | collaboration and contribution: Cincinnati Museum Center (as Dr. Jacqueline Belwood) | |
| Rick Bridges | .... | technical advisor | |
| DeVere Burt | .... | collaboration and contribution: Cincinnati Museum Center | |
| Howard Chapman | .... | production assistant | |
| Allison Chase | .... | production coordinator | |
| Tom Cowan | .... | segment director | |
| Kim Cummingham | .... | in remembrance of: caving and research pioneer | |
| Kim Cunningham | .... | science advisor | |
| Damian Doucette | .... | location scout | |
| Dave Duszynski | .... | collaboration and contribution: Cincinnati Museum Center | |
| Janna Emmel | .... | researcher | |
| Nancy Finley | .... | production coordinator | |
| Barbara Flagg | .... | researcher (as Dr. Barbara Flagg) | |
| Debbie Fogel | .... | controller | |
| Mary Kaye Kennedy | .... | collaboration and contribution: Cincinnati Museum Center | |
| Federico Laurent | .... | production assistant | |
| Larry Mallory | .... | science advisor (as Dr. Larry Mallory) | |
| Douglass McDonald | .... | collaboration and contribution: Cincinnati Museum Center | |
| Luc Moreau | .... | science advisor (as Dr. Luc Moreau) | |
| Norman Pace | .... | science advisor (as Dr. Norman Pace) | |
| Arthur Palmer | .... | science advisor (as Dr. Arthur Palmer) | |
| Margaret Palmer | .... | science advisor | |
| Gordon Quattlebaum | .... | production coordinator | |
| John Scheltens | .... | researcher: National Speleological Society | |
| Wes Skiles | .... | segment director | |
| Kay Walten | .... | production coordinator | |
| Jill Yager | .... | science advisor (as Dr. Jill Yager) | |
Thanks | |||
| José R. de la Torre | .... | special thanks: College of Natural Resources, University of California at Berkeley (as José R. de la Torre Ph.D.) | |
| Alaine Gerente | .... | special thanks: Group 47 | |
| Antje Hofmeister | .... | special thanks: College of Natural Resources, University of California at Berkeley (as Professor Antje Hofmeister) | |
| Bruce Russell | .... | special thanks: BioMEDIA Associates | |
| Steven Ruzin | .... | special thanks: College of Natural Resources, University of California at Berkeley (as Steven Ruzin Ph.D.) | |
| Company credits | Technical specifications | Main details |