We turn to radio where morse code is a universal language. Morse Code is used to communicate in lots of other circumstances as well. Ships at sea can communicate with it.
Kids can do it for fun.
Lost hikers can use it for distress signals. Morse Code can be transferred by sound or by light. Sound is preferable. It can be done with a flashlight, an airhorn, any object that makes sounds or produces light. Morse Code is divided into longs and shorts.