A Danish underwater thriller for the whole family. Everything appears idyllic when the two brothers Christian and Ask spend their summer at their grandfathers in a small fishing village. However, during a dive the two brothers find a mysterious wreck of a Nazi U-boat, which a team of professional divers are also very interested in. From there on the events speed up and a story which covers teenage love, supernatural spirits and evil Nazis begin to unfold.
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This post is also available in: Danish
| Robert Hansen | Kristian |
| Ralf J. Hollander | Ask |
| Laura Aagaard | Maja |
| Otto Brandenburg | Jørgen |
| Jytte Abildstrøm | Inge "The Bone" Randskov |
| Baard Owe | Eric Simms |
| Jesper Asholt | Simon |
| Bjarne Henriksen | Torben |
| Ditte Gråbøl | Birthe |
| Owe Christian Owe | Niels |
| Bjørn Floberg | André |
| Rasmus Haxen | Doctor |
| Søren Seehusen | Spirit 1 |
| Viktor Zeuthen | Spirit 2 |
| Benjamin Monrad | Spirit 3 |
| Vivienne McKee | English voice |
| Åke Sandgren | Director |
| Michael Obel | Producer |
| Peter Bech | Producer |
| Michel Schønnemann | Line producer |
| Tina Winholt | Line producer |
| Uffe Truust | Production assistant |
| Niels Sejer | Production design |
| Jeppe Tolstrup-Møller | Runner |
| Søren Engberg | Runner |
| Kristine Obel | Helper |
| Benedikte Paaske | Production secretary |
| Charlotte Christensen | Production secretary |
| Annemarie Aaes | Script supervisor |
| Simon Bang | Storyboard |
| Iben Snebang | Assistant director |
| Peter Bækkel | Assistant director |
| Dan Laustsen | Cinematography |
| John Frimann Rasmussen | First assistant camera |
| Andrew Grant | Clapper/loader |
| Mikael Kort Kristensen | Grip |
| Jimmy Leavens | Grip |
| Peter Alsted | Assistant grip |
| Lars Høgsted | Stills |
| Henrik Ploug | Stills |
| Knut Petersen | Steadicam operator |
| Jens Schlosser | Director of Photography, 2. unit |
| Daniel Parmo | First assistant camera, 2. unit |
| Kasper Leick | Film editing |
| Jacob Wirth Carlsen | Props |
| Morten Isbrand | Props |
| Torben Stig Nielsen | Assistant art director |
| Rasmus With | Set dresser |
| Sebastian Bacquaert | Props assistant |
| Nilo Hansen | Assistant set dresser |
| Anne Cathrine Sauerberg | Makeup artist |
| Thomas Foldberg | SFX makeup |
| Tina Norup Helmark | Makeup assistant |
| Maria Gyllenhoff | Costume design |
| Rikke Korfix | Costumes |
| Morten Degnbol | Sound design |
| Roar Skau Olsen | Assistant sound designer |
| Henrik "Gugge" Garnov | Assistant sound designer |
| Lars Lund | Assistant sound designer |
| Julien Naudin | Noise |
| Peter Riis | Lighting technician |
| Martin Lerche | Lighting technician |
| Michael Sørensen | Lighting technician |
| Jesper Westh | Assistant lighting technician |
| Torben Jacobsen | Assistant lighting technician |
| Thomas Kristensen | Underwater operator |
| Thomas Borch Nielsen | Visual effects supervison |
| Carsten Jacobsen | Diving assistant |
| Jimmy Larsen | Diving assistant |
| Jesper Nobel | Diving assistant |
| Thomas Håkansson | Stand in diver |
| Bo Petersen | Stand in diver |
| Jesper Nobel | Stand in diver |
| Kim Wemus | Diving helper |
| Nalle Bjørn Kopp | Diving helper |
| Søren Tabur | Diving instructor |
| Birger Jensen | Diving instructor |
| Rikke Raben | Props master |
| Joakim Zacho Weylandt | Props master |
| Dansk Special Effekt Service | Special effects |
| Hummer Høimark | SFX coordinator |
| Ilja Jon Bak Nielsen | 1. assistant coordinator |
| Lars Andersen | Technician |
| Kim B. Petersen | SFX assistant |
| Stig Günther | Stunt coordinator |
| Mikkel Corneliussen | Stunt double |
| Nicolai Berthelsen | Location manager |
| Morten Kleener | 2. unit location scout |
| Jette Termann | Caster |
| Kjersti Paulsen | Caster, Norway |
| Anders Engelbrecht | Boat coordinator |
| Anne Marie Borella | Consulent in hospital |
| Michael Dela | Sound |
| Nino Jacobsen | Sound |
| Michael Nielsen | Color timer |
| Thomas "Topgun" Steen | CGI line producer |
| Kirsten Skytte | CGI supervisor |
| Lars Brok | Compositing artist |
| Thomas Pors | Additional compositing |
| Henrik Loop | 3D animation/tracking |
| Tonni Zinck | 3D animation |
| Leo Kivi Kristensen | Additional 3D |
| Morten Rasmussen | VFX editing/morph |
| Rasmus Videbæk | VFX camera, 2. unit |
| Theis Molin | VFX camera assistant, 2. unit |
| Ole Ziegler | VFX stills |
| Kira Brandt | VFX stills assistant |
| Christopher Jacobsen | Programmer |
| Tine Borch Nielsen | Intro and end credits |
| Martin Gårdeler | Ghost animator |
| Aksel Studsgarth | Ghost animator |
| Jeppe Nygaard Christensen | Ghost animator |
| Peter Skotte Møller | Ghost animator |
| Vagn Eric Rose | Assistant film editor |
| Lars Larsen | Assistant technician |
| Mikkel E.G. Nielsen | Film editing, trailer |
| Jan Lehmann | Raw footage |
| Randall Meyers | Composer |
| Det Danske Filmstudie | |
| Rainbow Studio AS, Oslo | |
| Imperial War Museum | |