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Jakub Bures (left) and Honza Kara makes a working boat with plastic bottles.

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Firstly the bottles are attach to each other. The bottles are filled with dry ice for extra buoyancy.

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They used more than 50,000 bottles to construct their boat.

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A frame was needed to the support the bottles once they were in the water.

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They both attaching a rudder to the boat frame.

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From repurposed bicycle parts they build the control mechanism of the boat.

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Sail the plastic bottle boat down the Elbe River from their hometown of Nymburk in the Czech Republic, to the city of Hamburg, Germany.

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The purpose is to raise awareness of plastic bottle pollution in Europe.

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But would their boat actually float?

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Yes it did. They set sail on July 12, 2014.

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There are lots of people who support to Kara and Bures.

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The view from inside the cabin.

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Super meta.

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The total journey will be 530 miles and going well so far.

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No steering or other technical malfunctions.

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The adventure to last a month or two before they reach Hamburg.

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Their journey’s route from Prague in the south, to Hamburg in the north.