How did hamming's voice come from?

On the southeast sea surface of Naozhou Island in Zhanjiang, Guangdong Province, there will be regular "whoops, whoops" on the sea surface whenever the weather deteriorates or before the storm warning. This sound is like a muffled thunder, one high and one low, uneven. The fishermen who went out to sea heard this sound and immediately got off the net and quickly returned to avoid the storm.

Fishermen call this sound "hamming". But where did this sound come from?

There is a legend among the fishermen in Naozhou Island: "Haiming" is the sound made by a "water drum" in the sea. This "water drum" was put into the sea by the French when they built an international lighthouse on Naozhou Island. Lighthouses guide passing ships, while "water drums" are used for weather forecasting. The sound of the "water drum" is an "alarm", which indicates that a storm is coming.

It is said that this legend has aroused the interest of relevant parties and made some investigations and studies for it. Zhanjiang, formerly known as Guangzhou Bay, was occupied by France in the late Qing Dynasty (1898) and was ruled by France until 1943 when it was occupied by Japan. The waterway near Naozhou Island is the throat of entering and leaving Zhanjiang Port. Due to big waves and rapids, ships often sink and hit rocks. In order to meet the needs of colonization and plunder, the French invaders once built a large lighthouse on the island of Naozhou to guide ships, but it is unknown whether the musical instrument "water drum" was put into the sea at the same time, and no historical materials have been found in this regard. To this end, a ship was sent to search in this area and found nothing. Therefore, it is not known whether there is such a musical instrument as "water drum".

1969, people once found a group of "sea pigs" living in this area. This "sea pig" may refer to "finless porpoise" or "dolphin". Then, some people think that "Hamming" is a "porcupine", and they feel restless when they anticipate that the weather is about to get worse, so they make a "whoop, whoop" cry. This sound may also be an exchange signal between "sea pigs".

From 1976, the sound of "hamming" gradually weakened or even disappeared. Some people think that this is because the "water drum" has been in disrepair for a long time, and its function has gradually weakened or even been completely damaged. People who think it is called "sea pig" say that this is because people's activities in this area have increased since the 1970s, which has affected the normal life of "sea pig", so "sea pig" has moved to other places, and of course there is no sound of "sea singing".

Others think that "hamming" is the sound of a storm coming from a distance. The propagation speed of sound on the sea surface and seawater is much higher than that of the storm moving center. Therefore, the distant storm sound reached the southeast sea surface of Naozhou Island before the storm, making the sea surface emit a "blare, blare" wind.

These statements are untenable. For example, people who say that it is the sound made by the "water drum" cannot confirm whether the "water drum" exists; People who say it is a "sea pig" can't answer that "sea pig" only barks at sea in this area, and it won't bark when it moves to other places; Those who claimed that it was a storm sound coming from a distance could not explain why there was no storm sound in other sea areas and why the storm sound here weakened and disappeared after 1976.

The phenomenon of "sea singing" that once appeared in the southeast waters of Naozhou Island is still a mystery.