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Before the development of radio communication, when a ship was a danger there were a number of ways to signal for help. For example flying a signal flag were common or Using bells and foghorns repeatedly were also ways of making other ships hear you. These are still used today in many cases.

However, with the improvement of wireless telegraphy, saliors started using Morse code to send masseges. Morse code is a type of code with long and short sound. The most well-known Morse code message asking for help is SOS.

The german government was the first to use the SOS signal at the begining of the 20th century. It became an international distress signal in 1908.

Some people believe that SOS stands for 'Save Our Ship' or 'Save Our Souls,' but that's not true. In fact, the letters don't stand for anything they were just the simplest letters in international morse code. However, people probably used these phrases to help them remember the letters.

People have used SOS as a visual distress signal by signalling with three short three long and three short light flashes or by writing it in the sand or snow. The fact that you can read SOS right side up and upside down is very useful and has made SOS more popular than the word help.

When the Titanic hit an iceberg and started sinking two of crew members used radio communication to ask for help. they also tired sending an SoS message to the nearby ship, the Californiai, by using Morse lamp. Unfortunately, the crew of the Californian didn't realise what was happening until it was too late.