In 1937, a schoolteacher on the island of Maui challenged a group of poverty-stricken sugar plantation kids to swim upstream against the current of their circumstance. The goal? To become Olympians. They faced seemingly insurmountable obstacles. The children were Japanese-American, were malnourished and barefoot, and had no pool; they trained in the filthy irrigation ditches that snaked down from the mountains into the sugarcane fields.