Some worried passengers left a traditional dhow-turned-pleasure boat because it was swaying precariously even before it left on a cruise that ended with the vessel flipping over, drowning 57 people, a British survivor said Saturday.

The dhow, an ancient form of sailboat used in the Gulf, had a permit only for use as a floating restaurant, not for passenger cruises, an Interior Ministry spokesman said. The spokesman, Col. Tariq al-Hassan, also said the boat's captain, who has been detained for questioning, was not licensed to pilot the craft.

Simon Hill, who survived the capsizing, said the boat was swaying even before it left shore, and 16 uneasy passengers disembarked. He said a representative from the tour operator urged people to move below deck to distribute weight more evenly.

"We asked the captain if he was happy to leave, and if he wasn't he should say so, and we would not leave. At 8 o'clock we sailed," Hill told a news conference in Manama.

The dead from Thursday night's accident included 21 Indians and 15 Britons, including a number of executives involved in the construction of Bahrain's World Trade Center, a nearly completed complex of two 50-story skyscrapers in the shape of sails that are to be the tiny Gulf island nation's tallest buildings.

The construction firm Murray & Roberts Group had rented the dhow, the Al-Dana, for a party celebrating the towers' construction. But during the cruise, the craft tipped, sending people who had been dancing on the upper deck sliding into the water. It then flipped entirely, trapping passengers on the lower deck.

Hill, a manager with the construction firm, said the Gulf waters were calm during the cruise. About a half-mile from shore, he said, the boat made a U-turn to head back.

"One minute we stood talking and having a good time, enjoying a very nice evening. It was a pleasant evening. And then in seconds, it went very quickly," he said.

"I looked and I saw people sliding down the boat to one side, through the gap, and before I knew it I was in the water, under the water, and there were people everywhere in the water," he said.

Those who were on the top deck swam away. But about half the passengers were below deck, some of them trying to smash the glass windows underwater, Hill said.

"We didn't see anyone that was underneath come out," he said.

Another passing pleasure boat picked up some passengers from the water — including two confirmed safe Saturday — and within 10 minutes a coast guard boat arrived, followed by a U.S. Marine boat and another Bahraini coast guard vessel.

Sixty-nine of the 126 people believed on board were rescued, and al-Hassan said authorities were still searching for anyone who might be missing and uncounted.

British Foreign Office Minister Kim Howells said the impact of the disaster on the British community in the tiny Gulf island nation "has been enormous."

"It's a relatively small ex-pat community and to lose this number of people in a single accident has been a great trauma," Howells said Saturday.

The capsizing struck a heavy blow to the top management of the South Africa-based Murray & Roberts Group and its partners working on the construction of Bahrain's World Trade Center.

The dead included 10 employees of Murray & Roberts and six employees of the engineering firm Atkins, which was handling the design of the World Trade Center.

The companies involved in the project were to meet to determine how the accident would affect construction, said Samir Nass, vice chairman and managing director of Nass Corp., a top partner in the construction.

"There are so many firms that are subcontractors who were also on the boat," Nass said. "It's too hard to tell at this stage what will be the extent of the delay, if any."

A shopping mall at the base of the towers is scheduled for opening in August, with the office towers themselves due for opening later in 2006.