What happens to articles washed up by the sea if no owner claims them? 
Articles washed up by the sea, with no owner coming forward to claim them, shall belong to the person who finds them and initially takes possession. If the articles were owned by a Muslim or a dhimmi, one fifth of the property shall go to the treasury, and the remainder will belong to the finder. If the former owner is known and is either a Muslim or a dhimmi, ownership shall revert to them. If the former owner is not known, the provisions relating to lost property shall apply.