In the event of a serious crisis communication will be a challenge to say the least. You will likely have to deal with the power being out, cell phones being non operational, and the need to communicate covertly. In this kind of circumstance Morse code is a god send. It requires little to no power or technology, and very few people are able to interpret the Morse code alphabet. In this day and age Morse Code is a lost skill, yet fortunately it is very easy to learn.