A 33-year-old man jumped into the Arabian Sea from Mumbai's Bandra-Worli Sea Link in the early hours of Thursday, leading to a search, an official said.
The operation is being carried out by the Mumbai police and fire brigade with the help of the Indian Navy and Coast Guard, the official said.
The incident happened around 4 am when Vinay Yadav, a resident of Jogeshwari in the western suburbs of Jogeshwari, jumped into the sea from the cable-stayed bridge.
As he came in an Innova car, parked it on the bridge and jumped into the sea, Yadav said.
The local police and fire brigade began a search. The Indian Coast Guard and Navy were roped in as they faced difficulties, the official said.
He added that the reason behind Yadav's suicide is not yet known.
On July 31, the Navy and Coast Guard found a 57-year-old man who leapt from the sea from the bridge, causing a search by the Navy and Coast Guard. The body was recovered the next day.