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The six Americans on board include captain David Dyche, 58, his wife, Rosemary, 60, and their son David, 17. Also aboard was their friend Evi Nemeth, 73, a man aged 28, a woman aged 18, and a British man aged 35.
The leader of Friday's search efforts, Neville Blakemore of New Zealand's Rescue Coordination Centre, said it's now logical to assume the 70-foot (21-meter) boat sank in a storm but added that it's possible some crew members survived either in the life raft that was aboard or by making land.
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On the day the boat went missing, a storm hit the area with winds gusting up to 68 miles per hour and waves of up to 26 feet.
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[Blakemore] said the logical conclusion is that the boat sank rapidly, preventing the crew from activating the locator beacon or using other devices aboard, including a satellite phone and a spot beacon. He said that unlike many locator beacons, the one aboard the Nina is not activated by water pressure and wouldn't start automatically if the boat sank.
Dyche is a qualified captain, and he and his family are experienced sailors. Blakemore said the family had been sailing around the world for several years and was often joined on different legs by friends and sailors they met along the way.
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New Zealand meteorologist Bob McDavitt was the last person known to have been in contact with the schooner, when the boat was about 370 nautical miles west of New Zealand.
He said Nemeth called him by satellite phone on June 3 and said, "The weather's turned nasty, how do we get away from it?"
He advised them to head south and brace for the storm.
The next day he got a text message, the last known communication: "ANY UPDATE 4 NINA? ... EVI"
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