Natasha Narang, 30, a Ph.D. student at the University of Tasmania, was last seen on CCTV footage of the university, media reported.
According to a report in The Examiner, police search and rescue officers scoured the Tamar river in Australian state of Tasmania after discovering some of her personal items on its banks.
Helicopters were pressed into action but no breakthrough has been reported.
According to the report, Narang, who hails from the Punjab state in India, had moved to Tasmania with her husband Sandeep in November last year.
Police are reportedly suspecting study-related stress behind her disappearance.