The ancient people now known as the Proto-Dahu-Kemba (or just PDK) were a race of Ikhe who lived on the coast in the north-east of the continent of Aheku. Archaeology tell us that they remained in this area until around OH -186X (-1500 BC in our world).
Evidence from this date on indicates a migration to the west along the coast. We know from the speed of their movement and its narrow pathway that this was not a gradual spreading west, but a conscious migration. The speed of their travel suggests movement was partly by land and partly by sea. We do not know however what motivated the move.
We know the Proto-Dahu-Kemba had boats, including outrigger canoes and katamarans. They also had good navigation skills. It is thought that katamarans were used to transport goods and passengers and outriggers as scouts and protectors of the larger vessels.