Such an unusual sea people are called silks and "live" in Scotland on the Orkney and Shetland Islands. However, the “habitat” of seal people is not limited to these territories.
Similar myths exist in Iceland, the Faroe Islands, and there are also known analogues in Irish legends and in the folklore of many other cultures.
There are many versions of the origin of unusual sea inhabitants, and they are all diverse. According to some legends, these creatures contain the souls of those who died at sea, according to others, they are the descendants of people expelled to the sea for their sins.
People-seals are a wonderful peace-loving people who live in the depths of the sea in the form of seals. However, they are also capable of taking revenge on people if they anger them.
Some Scottish Islanders killed seals only when absolutely necessary. There was a belief that killing a seal could bring trouble.
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Periodically, the silks could shed their skin and come to land in human form. But if you hide the skin, then the sea inhabitant will not be able to return home.
A huge number of fairy tales are dedicated to this, where in this way (hiding a seal skin) people married beautiful silk girls.