How to Transfer messages like a spy with dead drop devices

This video discusses Dead Drop Devices and how to use them to transfer messages. The video starts by explaining what Dead Drop Devices are. They are basically common everyday objects that are hollow inside to store a message. The video shows a large lag bolt and a spike that are actually Dead Drops. The head of the dead drop bolt screws off and reveals a hollow cylinder used to store something valuable. The second object is a spike that is supposed to be shoved into the ground so that it will be concealed. It is also waterproof so that anything you store inside will be protected from the weather.