Here you can see the two different boat version we built. The right one was the first version and had the name "ICEBREAKER". We wanted to use it, but the sealing did not work at all, the boat swam literally like a brick. The right version was the final version, it id a simple boat, built with two old water bottles and a lot of duck tape. In the middle it was connected by a aluminum blade, in which we had pulled two holes for the engine tubes.