Roiling flood waters in the Danube have made it impossible for rescuers to reach the wreck of a river boat two days after it sank in the Hungarian capital.
One rescue diver was swept away and had to be saved, divers said. Authorities said on Friday it was unsafe to reach the wreck.
Twenty-eight people are feared dead, nearly all of them South Korean tourists, after a pleasure boat struck a cruise liner in heavy rain in Budapest on Wednesday night.
Seven South Koreans were confirmed killed and seven rescued. Another 21 people are still missing, 19 of them South Korean tourists, and officials say there is little hope any will be found alive.
Hungarian authorities arrested the captain of the cruise liner late on Thursday. His lawyers said on Friday he denied blame and regretted he could not avert the crash.
Family members of the Koreans missing or killed began arriving in the Hungarian capital, some covering their faces as they made their way through the arrivals terminal. They were met by embassy staff and driven off in black vans.
A crane ship was docked near the wreck in preparation for recovery operations, but divers fought strong currents in the river, "conditions that preclude any approach of the hull", the Interior Ministry said in a statement.
A diver who works at the scene and requested anonymity told Reuters they would probably have to wait for flooding to subside, at least several more days, before they can attempt to secure the site and enter the wreckage.
The current immediately swept away a diver who had submerged on Friday. A hose bringing him air had to be severed and a rescue operation had to be mounted to bring him back up.
The 135 metre cruise liner hit and sank the Mermaid, a smaller pleasure boat carrying Korean tourists.
South Korean Foreign Minister Kang Kyung-wha, who flew to Budapest on Friday, said the aim was to recover all the bodies.
"We strive to ensure no corpses are lost from the wreckage or the riverbed," she said. "I hope this level of effort can be sustained."
Swiss-based Viking Cruises, which owns the larger vessel, said in a statement on Thursday it had co-operated fully with the authorities.
The Ukrainian captain of the cruise ship, identified by police as C. Yuriy from Odessa, denied blame, MTI news agency quoted his lawyers as saying.
He was "shaken by the consequences of the accident and regrets that he had no way to avoid the accident, and expresses his condolences to the families of the victims", they said.
Prime Minister Viktor Orban said he too was "shaken".
Very Good Tour, the travel agency that brought the Korean group to Budapest, told the Korea Times that it would sue once the causes of the accident were determined.
"We plan to take legal action ... because it is related to compensation for our customers," Korea Times quoted an official of the travel agency.
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