The Movie

Undune is a documentary about Terra Preta, Feces & Mars. Terra Preta: a way to create a fertile, black soil out of our feces. Yes, feces, turds, poop, number 2, whatever you want to call them, they’re inevitable and – strangely enough – valuable. In a mixture of fiction and documentary, Undune tackles this everyday taboo – and dares to ask: are we wasting our waste when we flush? Undune tells the story of Gregor, a young physicist who wants to help colonize Mars. Through interviews with Terra-Preta pioneers, Gregor begins to construct a method for making human excrement usable on the red planet. His interviewees believe in Terra Pretas’ potential to save our planet, but Gregor seems to be more interested in cloaking his surroundings in daydreams, including brief episodes that follow the discoveries of a space explorer who’s been stranded on Earth. With the skewed perspective of a true outsider, the explorer comments on mankind’s peculiarities – including our fascination with wasting our waste.

UNDUNE will make you ask yourself: Is there such a thing as useless shit?

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September 28, 2015DVD-Production

We are going to start the DVD-production soon. We are taking pre-orders already now. Contact us via the contact form on this website or via

July 21, 2015Premiere

July the 26th 2015 at 3.30pm, will be the premiere of the documentary Undune at FSK Kino (Segitzdamm 2 - 10969 Berlin Kreuzberg).

October 22, 2014Preview DVDs for Festivals

The last weeks, we worked like crazy to produce a preview DVD for festivals. The first 10 DVDs will be sent out today.


Hp 400 345

Dr. Haiko Pieplow

Haiko Pieplow has a doctorate in soil science and is a pioneer of Terra-Preta toilets. Through years of private research, he has developed it for his personal use. In order to promote this method, he constantly gives talks and workshops on Terra-Preta and Tera-Preta toilets.

Together with Ute Scheub and Hans-Peter Schmit, he has shared his knowledge of Terra-Preta and its production in the book “Terra Preta – die Schwarze Revolution aus dem Regenwald]”.

Pt 400 345

Peter Thomas

Peter Thomas is an expert on waste water systems. He helped to develop the Terra-Preta toilet system and Terra-Boga Projects at the botanic Gardens Berlin-Dahlem. Waste water from several employee and guest toilets is collected and, in a system that he helped to develop, the waste is treated to create the basis for Terra-Preta production.


Mh 400 345

Marko Heckel

Marko Heckel holds a degree in Geo-ecology and trades items used in Terra-Preta production, Terra-Preta toiltes and EM-Products. He regularly gives talks on Terra-Preta. EM is a special mixture of milk enzymes, yeast and other fungi that coexist within an environment that is easy to control. With this mixture, the production of Terra-Preta is simplified and the hurdle to using Terra-preta toilets is lowered considerably.


Tm 400 345

Tobias Morgenstern

Tobias Morgenstern is a Jazz accordionist, theatre and film musician and also runs the Theatre Am Rand in Oderbruch. For several years, he has, with great enthusiasm, used Terra-Preta toilets as guest toilets in Theatre am Rand. He is the author of “Scheißkantate” (shit cantata), setting Hunderwassers “Scheißkultur – die heilige Scheiße” (shit culture – the holy shit) to music.

Theater am Rand

Ak 400 345

Annemarie Kaiser

Annemarie Kaiser studied agricultural sciences and is currently starting up an organic farm close to the Theatre am Rand in Oderbruch. On this farm, feces collected at Theatre am Rand will be turned into Terra-Preta and used on the fields. The products from the farm will be sold at Theatre am Rand and also used in the Restaurant, currently being built there.

Ro 400 345

Ralf Otterpohl

Ralf Otterpohl is professor and head of the Institute für Abwasserwirtschaft (Institute for waste water treatment) at the TU Hamburg-Harburg. His research has provided the term Terra-Preta sanitation for Terra-preta toiltes and lead to international interest in the topic. In 2013, he organized an international conference on Terra Preta toilet systems. His research group worked on the development and implementation of a public Terra-Preta toilet system in Hamburg Central train station. With an innovative toilet design, he and his team won the WTO International Toilet Design Award in 2012.


Ub 400 345

Ulrich Braun

Ulrich Braun has a degree in Biology and has worked for many years together with the Institute for waste water industries at the TU Hamburg-Harburg on the implementation and development of the public Terra-Preta toilet system in Hamburg Central train station. This system can recycle toilet waste completely. It works without the introduction of fresh water and also creates the basis for Terra-Preta production and mineral fertilizer.




Gregor and Spaceman: Gregor Pieplow
Woman in front of City-Toilet: Elisabeth Pieplow
Voice-Over Spaceman: Hanis Müller
Kurtis Hairston, Gregor Mönke , Theresa Schlamp, Christof Zink, Henning Kurzke, ChristineHesse, Marius Muche, Florian Titze, Silke Zink, Steffen Roland, Else Hilbig, Fritzi König, Daria Kovezina, Lydia Böttcher, Christian Lück, Franziska Seise, Elaine Mc Sweeney, Dimitris Argyriou, Christian Meller, Ulrike Nietsch, Marlene Stepp, Max Kurpiers, Franziska Schulz, Theresa Penndorf, Sarah Lück


Dennis Rätzel

Art Director

Gregor Pieplow

Written by

Gregor Pieplow
Dennis Rätzel
Lydia Böttcher


Dennis Rätzel
Gregor Pieplow
Dimitris Argyriou

Director of Photography

Anne Braun

Camera Operators

Anne Braun
Hannes Francke
Jennifer Ort
Marius Muche
Tomasz Winczewski
Thomas Loos

Sound recordist

Jakob Schleicher

Assistant Directors

Sören Eichhorst
Lydia Böttcher
Christine Hesse


Laura Cramer
Judith Stündl
Theresa Schlamp


Manuel Müller


Aileen Klein
Gregor Pieplow
Atelier Pink Passion
Rebekka Rinner
Thomas Nahlob

Set Constructions

Max Kurpiers
Ludwig Dobe
Franziska Schulz
Johannes Regin
Thomas Nahlob
Marlene Stepp
Lydia Böttcher


Anne Braun
Alexander Heimen

Animations and Drawings

Gregor Pieplow

3D-Animation Mars

Christof Zink

Timelapse Photography



Dimitris Argyriou

Color Grading

Dimitris Argyriou
Hannes Francke

Sound Design and Sound Mix

Kai Müller


Stephanie Geiges

Original Music



Hanna Henigin, Esther Weinert, David Madry, Philipp Weilandt, Sven Meissner, Oliver Henneberg, Rainer Hainich, Chris Zabriskie, Jonathan Siemasko, Partyproduktion, HOLZAPFEL + KONSORTEN GmbH & Co. KG, Carmen Rittel, BLACK STAR, Tria-Terra, Theater am Rand Betriebs GmbH, Panke e.V., Arthur Guljamow, Rockpaper, Griebsch + Roshol Druck, Videoequipmentverleih Wunderlich, Katholische Kirchengemeinde St. Mauritius und Msgr. Winfried Onizazuk, Nahkauf Frisch Markt Duong, Berliner Wasserbetriebe und Uwe Schultze, Dagmar Ewald, Kiri Mochrie, Maike Majewski, Summer Banks, Christine Pieplow, Thomas Gürtler, Aliki Karanikas, Katharina und Jens Saadhoff, Johannes Regin, Kurtis Hairston, Uri Yacobi Keller, Leo Zhao, Elisabeth Pieplow, Matthias Fritsch, Volker Dohmwirth, Richard Herter, Knut Schottstädt, Jan Eckardt, Angela Clinkscales, Lucie Hermann, Ingo Frost, Benjamin Goytisolo Hamann, Hendryk Probst, Daria Kovezina, Lena Hein, Noé Furon, Konstantin Kraider, Johanna Assmann, Peter Birett, Sunburste Mc, Marina Langenbach, Dirk Krischenowski, Inge Gentz, Jens Hakenes, Willi Kiewitt, Stephan Bulheller, Sandra Strauch, Ralf Forkmann, Kathrin Forkmann, Ralf Lisenbart, Kerstin Linsenbart, Jens-Uwe Rätzel, Andrea Rätzel, Katharina Saadhoff, Sarah Lück, Mario Binar, Robert Kunze, Dominik Haubrich, Anasha Petersen, Frank Janssen, Nani Banks, Luigi Mercuri, Tom Crozier, Ramona Kelm, Immanuel Dorn, Sebastian Schmittner, Franziska Seise, Helene Foltan, Daniel Warmuth, Judith Stündl, Martin Schott, Britta und Hanis Warnsholdt, Anja Freyhoff, Malte Sieber, Giulia Pines, Mario Mulansky, Mariana Camarena, Maria Kolitsch, Paul Elling, Elisabeth Pieplow, Steffen Roland, Jörg Ehlert, Niklas Fred, Lion Vollnhals, Heiner Buehlen, Christian Seifert, Kai Müller, Marlene Stepp, Jan Korte, Liz Maldonado Eisenheim, Maren Greiser, Sandra Walther, Christof Zink, Simon Dooley, Christiane Knöß, Jorka Schweitzer, Jantje Hannover, Sebastian Rothe, Henning Kurzke, Marietheres Otto, Lydia Böttcher, Katharina Ehlers, Alte Mühle Gömnigk, Holger Kienle, Sandra Franz, Karoline Albrecht

Terra Preta

Terra preta is the most fertile soil on this earth. Unfortunately, for a long time, it was well hidden in the tropical rainforest of the Amazon. But, thanks to the work of many inexhaustible researchers, we now know its origin: Over centuries, the people of the Amazon mixed their excrement with charcoal and fermented the mixture hermetically.

After fermentation, earth worms transformed the waste into soil. Thus replacing the meagre tropical soil with a permanently fertile soil.

„there is no reason why we should have any deserts on this Earth. [ ] It is not as if we don’t have the technology or resources necessary to re-vegetate the deserts.“(Marko Heckel)


Two steps are required to produce Terra-Preta: In the first step, charcoal is added to organic material such as kitchen waste or feces and fermented hermetically for one month.

In the second step, over a period of two to six months, earth worms ingest all the fermented material. Their feces create the Terra-Preta humus.

“The secret of Terra-Preta is that kitchen waste and charcoal have to be passed through a worm.”
(Haiko Pieplow)

Detailed instructions on how to produce Terra-Preta can be found through this Link:

Infographic »


Instead of flushing away faeces, we can make Terra-Preta out of them. Toilets, at the beginning of this process, are called Terra-Preta toilets. In Undune, several varieties are shown.

One variety is the dry toilet, which consists, basically, of a bucket in which the feces land. Urine is separated and used as fertilizer.

One of the public toilets in Hamburg Central train station is also a Terra-Preta toilet. Feces and urine are mechanically separated. A further innovation of this system is the so called black water cycle: the water used for flushing is processed and can be reused for further flushing.

“We have go to get this into our heads[ ]: What people are leaving with us is a valuable resource!”
(Tobias Morgenstern, when talking about his theatre guest and the separation toilets at Theatre am Rand)


In this list you can find all the screening-dates of Undune.

  • Reel Earth Environmental Film Festival: 2017-05-06 | 15:00 Uhr | Palmerston North, New Zealand
  • InScience: 2016-11-05 | 11:00 Uhr | Nijmegen, Netherlands
  • InScience: 2016-11-04 | 21:30 Uhr | Nijmegen, Netherlands
  • Cine'Eco: 2016-10-12 | 21:30 Uhr | Seia, Portugal
  • FIFIGROT-Groland Festival: 2016-09-22 | 19:00 Uhr | Toulouse, France
  • Freifeld Festival: 2016-08-26 | 21:00 Uhr | Oldenburg
  • Parks of Moscow: 2016-07-26 | 20:00 Uhr | Moscow, Russia
  • Nature Vision: 2016-07-24 | 13:00 Uhr | Ludwigsburg
  • Prizessinnengarten Berlin: 2016-07-23 | 21:00 Uhr | Berlin
  • Sokolniki Park: 2016-07-20 | 20:00 Uhr | Moscow, Russia
  • Pokrovskoe-Streshnevo Park: 2016-07-19 | 20:00 Uhr | Moscow, Russia
  • OSIRIS: 2016-07-01 | 21:30 Uhr | Tunis, Tunesia
  • Flimmerzimmer: 2016-06-23 | 20:30 Uhr | Berlin
  • FINCA: 2016-06-08 | 18:00 Uhr | Buenos Aires, Argentina
  • University Tunis: 2016-06-01 | 10:00 Uhr | Tunis, Tunisia
  • BUZZ CEE: 2016-05-04 | 17:00 Uhr | Buzău, Romania
  • Barents Ecology Film Festival: 2016-05-01 | 18:00 Uhr | Petrozavodsk, Russia
  • FReDD: 2016-04-05 | 09:30 Uhr | Toulouse, France
  • Station für Natur und Umwelt: 2016-04-05 | 18:30 Uhr | Wuppertal
  • Theater Am Rand: 2016-03-13 | 16:00 Uhr | Oderaue
  • Ecocup Festival: 2016-03-06 | 15:00 Uhr | Moscow, Russia
  • Fabrica: 2016-03-05 | 15:30 Uhr | Moscow, Russia
  • Boddinale: 2016-02-14 | 17:00 Uhr | Berlin
  • ALTE MU: 2016-02-05 | 19:00 Uhr | Kiel
  • Studentenklub Borsi34 e.V.: 2016-01-25 | 21:00 Uhr | Dresden
  • Uni Hohenheim: 2016-01-14 | 18:30 Uhr | Stuttgart
  • Freiraum "Die Zwille" TU Berlin: 2015-12-17 | 15:00 Uhr | Berlin
  • HNE Eberswalde: 2015-12-10 | 18:00 Uhr | Eberswalde
  • European Science Film Festival: 2015-12-04 | 10:00 Uhr | Vienna, Austria
  • University of Potsdam: 2015-11-26 | 18:30 Uhr | Potsdam
  • Utopia Film Festival Bremen: 2015-11-22 | 17:00 Uhr | Bremen
  • Umundu Festival: 2015-10-18 | 16:00 Uhr | Dresden
  • University BoKu: 2015-10-07 | 19:00 Uhr | Wien
  • Emergent Berlin Festival: 2015-09-12 | 16:00 Uhr | Berlin
  • SOLIKON-Congress: 2015-09-12 | 12:00 Uhr | Berlin
  • SPEKTRUM: 2015-08-27 | 20:00 Uhr | Berlin
  • Premiere in FSK-Cinema: 2015-07-26 | 15:30 Uhr | Berlin


We want to find as large an audience as possible for our film. We are interested in working with a distributor. If you are interested in distributing our film get in touch with us through the contact form

Of course you can organize your own screening of our film. Simply get in touch with us through the contact form, for a small fee you can buy the film on DVD or Blu-Ray from the end of 2015. Where necessary, we can also provide advertising material such as flyers and posters for your screening.

Buy Movie

You can order Undune via the contact form or at undunefilm(at) (please, replace the (at) by @). Just write a short message. The DVD costs 12 € plus shipping. For 17 €, you also get a the right to download the HD-version of Undune.

You can buy or rent the HD-version also directly at:


If you have questions or critiques or want to organize your own screening, please get in touch with us through the contact form.


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Dennis Rätzel
Herzbergstraße 123
10365 Berlin-Lichtenberg