Fireworks are very useful in addition to parties. In 1840 a two-masted ship carrying fireworks from China was stranded off the coast of Sumatra. Suddenly, in the middle of the night, pirates arrive, leaving the sailors helpless and helpless. The captain abruptly opened a firecracker box and set it on fire, exploding violently, slightly injuring one of the pirates. The rest of the bandits fled in fear.
Rockets and colorful lanterns are also used to signal ships at sea.