BUENOS AIRES - More than 150 passengers and crew escaped unhurt after their cruiseship struck an iceberg in the Antarctic Ocean and started to sink, an Argentine coast guard official and a spokeswoman for the ship's owner said on Friday.

Two passenger boats in the area were picking up the 154 occupants of the Explorer from the lifeboats they used to escape the ship, which ran into problems near the south Shetland Islands.

"Everyone is safe and accounted for," Susan Hayes, a spokeswoman for ship owner Gap Adventures, told CNN.

"Apparently they crashed into an iceberg," Pedro Tuhay, of the Argentine coast guard, told local radio as operations continued to save the vessel. "The boat's got a 23-degree list, but it's keeping steady very well."

"The ship was travelling out of Ushuaia in Argentina, travelling southbound to Antarctica, and off King George Island it hit some ice and began taking on some water," Hayes said.

She said 13 Americans had been on board, as well as British, Canadians, Australians, Dutch and other nationalities.

The ship, built in 1969 and refitted in 1993, was carrying 100 passengers and 54 crew on a cruise that was due to end by Monday.

The Explorer usually makes two-week cruises around the Antarctic, costing around 4,000 pounds per cabin.

The South Shetland Islands lie about 75 miles (120 km) north of the Antarctic Peninsula. They have been part of the British Antarctic Territory since 1962, although they are also claimed by Argentina and Chile.

Cruise trip travel has grown in Antarctica in recent years and Tuhay said 52 cruises were expected at the southern port of Ushuaia during this year's peak season from October to April.