Marinus Linden, a master deep-sea diver, sold his equipment and developed rheumatism to pay off his son's debts. He moved to the city, despised by his daughter-in-law and ignored by his son. His precious fish maw was thrown away, forced to live in the basement. Heartbroken, he left home and returned to the fishing port. There, he found a new life with his deep-sea skills, establishing an ecological marine ranch, protecting marine resources, becoming a respected guardian of the ocean.
