People Drifted to Okinawa in the Jomon era?

　There is a famous piece of folklore about the origins of the Okinawan peoples. It says, in the Jomon Era (13,000–300 B.C.), they migrated from mainland Japan by way of the Black Stream.
　In an attempt to check the truth of the legend, a group named, Nirai Kanai began a unique experiment. On August 1st, they threw 1,000 wooden tops into the waters off Yonaguni.
　3 buoys with tracking technology were also included in the experiment to help follow their path. The tops contain messages written by local children in a variety of languages, including English and Japanese.
　They ask that the finder please call and report the location at 03-3341-6852 or send an e-mail to ocean@nirai-kanai.org"