In 1939 they were warned that much of their land was about to be submerged by the construction of a dam .
They searched for a new home and found 10 hectares in Moroyama - machi , Iruma - gun , Saitama Prefecture .
In 1939 they were warned that much of their land was about to be submerged by the construction of a dam , so they searched for a new home and found 10 hectares in Moroyama - machi , Iruma - gun , Saitama Prefecture .