Does a man who saves a woman from drowning become her mahram (a relative one may not marry)?

Question:
Honorable Shaykh, may Allah grant you success. This is a woman asking, and she says: A man saved her from drowning, so does that make him her mahram?

Answer:
This is a ruling for the common people. They say that if a man saves a woman from drowning, he becomes her mahram, saving her from destruction. There is no basis for this. This is a statement with no basis. Yes, mahram status is only established through its causes. Yes, either through kinship or through a marriage contract. Yes.