Both lifeboats were launched to search again for a missing vulnerable woman who threatened to go into the water between Shoreham Beach and Widewater Lagoon at Lancing.
Both boats carried out a shoreline search westwards while the Shoreham coastguard team searched the beach area on foot.
The lifeboats were stood down after an hour of searching. The woman was found at Widewater Lagoon car by the coastguards and was handed over to Sussex Police.
This was third call in 24 hours to the same woman.