Three friends, Shimpei Yamashita, Masahiro Arai, and Takaaki Ito build and test a a water rocket in Japan. For more check out: https://goo.gl/6IqFiJ Shot 100% on the HERO3+® camera from ‪http://GoPro.com. Get stoked and subscribe: http://goo.gl/HgVXpQ Music