Susana Glorioso, 62, and Rolando Ortigas Glorioso, 63, were found early Dec. 23 in a car submerged under a Caltrain overpass, near the corner of East Hillcrest Boulevard and Hemlock Avenue, authorities said.
RELATED: 2 dead after car submerged in flooded Millbrae underpass, San Mateo County Sheriff's office says
Witnesses said two people were standing on the roof of their vehicle, just before first responders arrived and rescued them, according to sheriff's officials.
Emergency crews located a second car that was fully submerged and because the water was rising rapidly, the conditions were too dangerous for first responders to conduct a rescue.
After the water receded, investigators were able to confirm two people had become trapped in the vehicle and died, sheriff's officials said.
VIDEO: Residents of Millbrae street desperate for help to stop flooding