One of the first woman to sail around the world said the missing British sailors were "more than likely in the life raft".
Tracy Edwards, who has 30 years of sailing experience, said the missing yachtsmen "would have had the time to get the life raft ready" before the boat capsized in the Atlantic Ocean.
"Their personal beacons were set off. You have to manually set the beacons off. So it wasn't as if the automatic beacon from the boat was set off...and that is 18 hours. So one was set off and then another, 18 hours continual signal."
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.