The search for the four sailors on board the missing yacht Cheeki Rafiki will continue for another 30 hours, the US coastguard said.
If no new leads were found withing this time, the search will end for the final time.
Captain Anthony Popiel said he had spoken to the yachtsmen's families to tell them that the search could be suspended.
With no sign of a life raft or of debris, and with nearly 20,000 square miles having been searched, the hunt continues for another day.
Veteran yachtsman Tony Bullimore tells ITV News that there is a "strong possibility" the yachtsmen are still alive in the life raft.