Police say they were told that at least 150 Venezuelan immigrants came ashore at the south-western coast on Tuesday morning.
Police teams search for hours for the illegal immigrants.
They detained eight of them, their clothes still drenched from the journey across the Gulf of Paria earlier that morning.
Around 7 am, police received information that some five pirogues carrying at least 150 illegal immigrants came ashore at Beach Road, Santa Flora.
Officers of the Erin and Santa Flora CIDs and South Western Division Task Force responded.
But the immigrants were not found on the beach, believed to be have been swiftly taken away in vehicles driven by a man of Central Trinidad.
Around 11 am police intercepted a car at SS Erin Road, Siparia driven by a local man.
In the car were four men, three women and a child.
Their luggage was found in the trunk of the vehicle.
They were arrested and taken to the Siparia Police Station, and later handed over to Coast Guard officers to be placed in quarantine.
The driver of the car was also arrested pending charges.