"姚旭，'雪龙2'呼叫，我已到达卸货地，这里海冰怎么样？能不能卸货？"12月2日凌晨3点40分，正在南极执行中 国第42次南极考察的"雪龙2"号船长张旭德通过对讲机联系前方。 几分钟后，雪地车停在船舷左侧距离10米的位置。车门打开，身穿厚重的橙色企鹅服外加航空救生衣的姚旭 出现在大家眼前。他小心谨慎地走到船艉处，拿出卷尺，量了量"雪龙2"破冰时翻出来的海冰厚度。 海冰卸货危险重重，一辆雪地车拉2个雪橇，自重20吨左右，再加上十几吨的货物，总重量平均30吨。海冰 下的海水一般有四五百米深，如果海冰厚度不够，缺少承重力，雪地车就有可能掉入海水里。根据科学分析及多 年的实践经验，冰厚如果在1米以上，就能保证运输安全。 船长口中的姚旭是本次南极考察队内陆队队长，也是海冰作业执行副总指挥，曾参加过十几次南极科考，有 着非常丰富的海冰卸货运输经验。 中山站位于普里兹湾的东南沿岸。考察队向中山站运送物资，需驾驶科考船尽可能接近中山站，再通过冰上 运输或直升机运输完成卸货。其中，冰上运输俗称"海冰卸货"，即把货物放在雪橇上，再用雪地车拉着雪橇穿过 海冰送到中山站。 从驾驶台望去，冰面上出现了一字排开的海冰卸货车队，由4辆雪地 ...

Core Points - The article discusses the successful unloading operation of the Chinese research vessel "Xuelong 2" during its 42nd Antarctic expedition, highlighting the challenges and safety measures involved in unloading cargo on sea ice [1][7]. Group 1: Unloading Operation - The unloading operation involves transporting supplies to the Zhongshan Station, requiring the research vessel to approach as close as possible to the station before transferring goods via ice transport or helicopter [2]. - A convoy of unloading vehicles, consisting of 4 snowmobiles, 13 sleds, and 2 fuel tanks, was prepared for the operation [3]. - The unloading process is initiated after confirming that the ice conditions are safe for unloading, which is critical due to the potential dangers of thin ice [5][7]. Group 2: Safety Measures - The safety of the unloading operation relies heavily on ice thickness measurements, with a minimum thickness of 1 meter required to ensure the safety of the vehicles and cargo [5]. - Prior to the unloading, extensive drilling and measurements were conducted to assess the ice and snow thickness at multiple points to determine a safe unloading route [5]. - The captain and team members closely monitored the ice conditions, and the successful assessment led to a celebratory announcement to the team [6][7].

Group 1 - The 42nd Chinese Antarctic Expedition team has arrived near Zhongshan Station and is actively unloading supplies, with the "Xuelong" and "Xuelong 2" ships meeting for the first time in Antarctica [1] - The "Xuelong 2" ship has successfully transported over 300 tons of polar fuel to Zhongshan Station using a helicopter during favorable weather conditions [1] - Ice unloading operations are being conducted simultaneously, utilizing snow vehicles to transport containers and fuel from "Xuelong 2" to Zhongshan Station and inland bases [3] Group 2 - Nearly 90 team members have already arrived at Zhongshan Station to prepare for subsequent supply reception and research tasks [5] - To enhance operational efficiency, "Xuelong 2" is providing ice-breaking guidance for "Xuelong," which is approximately 32 kilometers away from Zhongshan Station [7] - A large-scale unloading operation involving both ships, helicopters, and snow vehicles is currently underway in Antarctica, with the unloading plan expected to last for two weeks [13] Group 3 - After over 30 hours of continuous ice channel widening and guidance by "Xuelong 2," the "Xuelong" ship, carrying about 1500 tons of supplies for Zhongshan Station, has successfully reached the unloading point [11] - Following the unloading operations, "Xuelong" and "Xuelong 2" will head towards Qinling Station and Great Wall Station, respectively [13]

Core Points - The "Xuelong 2" vessel successfully transported over 300 tons of polar fuel to Zhongshan Station using the "Xueying 102" helicopter during a favorable weather window [2] - The "Xuelong" vessel, carrying approximately 1500 tons of supplies, reached the sea ice unloading point under the continuous operation and guidance of the "Xuelong 2" for over 30 hours [3] - A comprehensive unloading operation involving both land and air is currently underway in Antarctica, with the unloading at Zhongshan Station planned to last for two weeks, after which "Xuelong" and "Xuelong 2" will head to Qinling Station and Great Wall Station respectively [5]