How to send sos signals on a desert island at night

Setting off fireworks: Setting off fireworks is the most common way to ask for help. Smoking during the day means putting some rubber pieces, raw leaves, moss, ferns and so on. On a fire, burning smoke can be generated to inform the outside world. When using fire at night, three open fires should be lit in the direction of possible residential areas, and the fire will send a distress signal.

Light signal: use a mirror to help bask in the sun during the day, if possible.