Message in a bottle is an item found on the southern shore of the second island in The Islands That Once Were Turtles network, by the tortle portal to the third island. It can be investigated to receive a treasure map, which leads players to The Hamlet.
This message in a bottle was last visible 4 days ago on 15 June. It will be visible again in 4 days on 23 June. (wrong?) Once a message in a bottle is found and when a player has walked near its spawn location when it was visible it will always be visible, unless the message in the bottle or its treasure map is in the player's bank or inventory.