A wooden ship sets sail with a crew of 15 and captain Thesophus, on the journey the wood gradually rots and a panel at a time the crew replace the rotten planks with metal ones. After a while before the ship reaches it's destination it is covered completely in metal planks.
A pigeon is sent at the beginning of the journey with a message to give as an alert to the destined settlement in order for them to make preparation of a reception party on the crew's arrival.
The question is ... will the ship be the same ship?
No, because the pigeon will never fly that far.