Seventy-five Sri Lankan Tamil refugees, apprehended on Saturday off Velankanni, were remanded in three days judicial custody, here on Sunday night.
The men were part of the rescued 120 refugees, who made an illegal bid to make a voyage to Australia on a fishing trawler.
The Keezhayur marine police have registered cases against the refugees under the Passports Act, 1967 and Foreigners Act 1946.
The arrested were taken to the Puzhal Prison in Chennai.
Women and children under 18 years of age remained lodged in a wedding hall here.