Jakub Bures (left) and Honza Kara makes a working boat with plastic bottles.
Firstly the bottles are attach to each other. The bottles are filled with dry ice for extra buoyancy.
They used more than 50,000 bottles to construct their boat.
A frame was needed to the support the bottles once they were in the water.
They both attaching a rudder to the boat frame.
From repurposed bicycle parts they build the control mechanism of the boat.
Sail the plastic bottle boat down the Elbe River from their hometown of Nymburk in the Czech Republic, to the city of Hamburg, Germany.
The purpose is to raise awareness of plastic bottle pollution in Europe.
But would their boat actually float?
Yes it did. They set sail on July 12, 2014.
There are lots of people who support to Kara and Bures.
The view from inside the cabin.
The total journey will be 530 miles and going well so far.
No steering or other technical malfunctions.
The adventure to last a month or two before they reach Hamburg.
Their journey’s route from Prague in the south, to Hamburg in the north.