There is no specific statement or historical evidence to accurately explain what the ancient Yaqui people believed would happen to land dwellers who entered the sea. The ancient Yaqui civilization, an indigenous group from northwestern Mexico, had their own cultural beliefs and traditions, but there is limited information about their specific beliefs regarding the sea. It is important to note that ancient cultures often had diverse and complex religious or mythological systems, so their beliefs may have varied among different tribes or communities within the Yaqui civilization.
