In this task, you are given news articles and you need to generate a highlight, i.e., a short summary, with a maximum length of 10 lines.

Input: Consider Input: (CNN) -- Efforts to rescue a research crew aboard a ship stuck in ice off Antarctica stalled Thursday after sea ice conditions made a key element of the rescue plan risky, Australian maritime officials said. The rescue plan called for a helicopter to ferry the passengers from the MV Akademik Shokalskiy to a Chinese vessel, where they would then board a barge to take them to an Australian icebreaker, the Australian Maritime Safety Authority (AMSA) said in a written statement. But the shifting ice conditions prevented the barge from being able to reach the Chinese vessel, the statement said. "Alternative measures to complete the rescue operation are now being investigated by AMSA and the ships involved," the statement said. The news is the latest chapter in a saga that began Christmas Eve after the Russian-flagged MV Akademik Shokalskiy got stuck in 10 feet of ice. Even if the rescue begins Friday, it will still be weeks before the research team will make it to Hobart, Australia, John Young of the Australian Maritime Safety Authority said. "Mid-January is our best guess," Young told reporters on a conference call. The rescue plan called for the helicopter, which can transport 12 people each trip, to ferry the ship's 52 passengers -- who include the research team and journalists -- to the Chinese icebreaker called the Snow Dragon, or Xue Long, the maritime agency said. The 22 Russian crew members of the Akademik Shokalskiy will stay aboard, it said. The passengers are then to be transported by barge from the Chinese ship to the Australian icebreaker Aurora Australis. That's because the Chinese helicopter can't land on the Australian icebreaker because of load restrictions, and ice conditions make it unsafe to land it next to the ship, AMSA said. "The preferred option is to wait for conditions that will allow the rescue to be completed in a single operation to reduce unnecessary risk," the maritime agency said. The master of the Akademik Shokalskiy has decided to keep the crew members on board until the pack ice eventually breaks up and allows the ship to move again, Young said. The vessel has enough supplies to keep the crew going for "a very long time," he said. Failed rescues . The planned helicopter rescue follows a failed attempt by the Chinese icebreaker, which made it six nautical miles from the trapped vessel before being stopped by the ice. That was followed by an effort by the Australian icebreaker, which was forced Monday to suspend efforts to reach the expedition because of bad weather. The Aurora Australis got within 10 nautical miles of the ship before it turned back. Over the weekend, an effort by the French icebreaker Astrolabe was called off by the maritime agency. In preparation for the helicopter rescue, members of the research team as well as the crew of the Akademik Shokalskiy marked a makeshift helipad on the ice where the helicopter can land. Video clips posted online by the research team showed people, with arms locked, walking to tamp down the snow. "As we understand, the helipad was suitable yesterday and will be suitable today," AMSA's Richard Wallace said. Once the passengers are safely aboard the Aurora Australis, the ship will complete a resupply mission to Casey Station, an Australian base in Antarctica, before making its way to Hobart, the maritime agency said. Viral sensations . The exploits of the research crew have gone viral, thanks in large part to Twitter and YouTube posts by those aboard the stranded vessel. Chris Turney, an Australian professor of climate change at the University of New South Wales, has tweeted photos of the stranded ship, the crew and penguins, who he said -- according to one post on Twitter -- "to check out what's going on." "The group on this ship is incredibly collegiate," said Alok Jha, a science correspondent for The Guardian newspaper, told CNN's Anderson Cooper 360. "There are a lot of skills and things people are sharing with each other." Turney has said there are regular briefings on the status of rescue attempts, and in the meantime, people are doing what they can to keep busy. That includes yoga and Spanish classes, Jha and Turney said. The group even managed to ring in 2014 with good cheer. "We're the A, A, E who have traveled far, having fun doing science in Antarctica!" a dozen or so of them sang in a video posted on YouTube. "Lots of snow and lots of ice, lots of penguins, which are very, very nice! "Really good food and company, but a bloody great shame we are still stuck here! Ice cold, cha cha cha! Ice cold, cha cha cha!" Spirits strong among passengers on ship stuck in Antarctic ice . CNN's Radina Gigova and Jethro Mullen contributed to this report.

Output: NEW: Ice conditions have stalled a helicopter rescue, officials say .
NEW: Alternative rescue measures are being considered, maritime officials say .
NEW: "The preferred option is to wait for conditions that will allow the rescue," they say .
Efforts by Australian and Chinese icebreakers to get to the crew have failed .


Input: Consider Input: (CNN) -- A competitor has died and another is in hospital following a tragic end to the World Sauna Championships in southern Finland. Russian Vladimir Ladyzhenskiy died Saturday after taking part in the final of a competition in which contestants are required to withstand rising temperatures for as long as possible. Finnish finalist Timo Kaukonen was also taken to hospital for treatment, organizer Ossi Arvela said in a statement posted on the event's website. Images of the contest showed Ladyzhenskiy and Kaukonen sitting side by side in the sauna. Both contestants can then be seen lying on the ground, apparently doused in water. Ladyzhenskiy appears to be suffering from severe skin burns. "The event was interrupted immediately after the accident. Competition organization grieves these sad events," Avela said. Finnish police and organizers are investigating the incident, Arvela said. But he said first aid personnel had been in place and all competitors taking part in the contest had provided doctor's certificates. "All the rules were followed," he said. The World Sauna Championships take place annually in the town of Heinola.

Output: Finnish event sees competitors attempting to withstand rising temperatures .
Russian finalist Vladimir Ladyzhenskiy died after Saturday's final .
His opponent, Finland's Timo Kaukonen, was taken to hospital .
Police are investigating incident but "rules were followed," organizers say .


Input: Consider Input: (CNN) -- Three people died Tuesday in an explosion in the Turkish capital Ankara, in what may have been a terror attack, Interior Minister Idris Naim Sahin told CNN sister network CNN Turk. "There was a powerful explosion in a car that was parked," the minister said, citing preliminary information. "The possibility that it was a terrorist attack is high." He said it was also possible that a gas explosion had caused the blast, "though that is a weak possibility." The explosion shook a crowded street in the center of Ankara, damaging vehicles and buildings on Kumrular Street near the Kizilay metro station, the official Anatolia news agency reported. An eyewitness described the scene as "terrible" and "very chaotic." "Cars were exploding. Pieces were spreading around. We were terrified," the unnamed witness told CNN Turk. Deputy Prime Minister Besir Atalay said earlier there were no deaths, but 15 people were wounded, Anatolia reported. Ankara governor Alaaddin Yuksel said officials, including police and a prosecutor, were investigating the cause of the blast. He said many cars were parked on the street with garbage bags under them at the time of the explosion. Five people are in surgery, he added. An emergency services doctor at Numune Hospital in Ankara said 10 injured people were brought to the hospital. One was in intensive care, one was in the burn unit and the other eight have light injuries, said the doctor. None of the injuries are life-threatening, said the doctor, who did not give a name. Doctors in state hospitals are not allowed to speak to the media. The explosion took place in front of the Cankaya municipal building, local official Bulent Tanik said on Turkish television. He cited eyewitnesses as saying a burning gas tank had been thrown out a window onto the street. Police have sealed off the street, Anatolia reported. --CNN's Yesim Comert and Talia Kayali contributed to this report.


Output: NEW: A car explodes in central Ankara, the interior minister says .
NEW: The possibility that it was a terror attack is high, he says .
Wounded people are taken to nearby hospitals .