Core Insights - The recovery of the ecological lander (Lander) was a significant event in China's 15th Arctic scientific expedition, marked by unexpected challenges despite favorable weather conditions [1][2] - The expedition aimed to understand the Arctic ice edge ecosystem's response to sea ice decline, utilizing advanced equipment to measure various environmental parameters [2] Group 1: Expedition Overview - The "Snow Dragon 2" research vessel departed from Shanghai on July 6 and arrived in the Arctic operational area on July 21, successfully deploying four sets of Lander during the expedition [2] - The last Lander recovery was scheduled for September 11, initially expected to be straightforward due to the absence of ice [2][4] Group 2: Recovery Challenges - The recovery process faced difficulties as the team could not locate the Lander's signal despite extensive searching, leading to increased pressure and urgency [4][5] - After a series of discussions and emergency plans, the team decided to return at night for another attempt, despite the challenges posed by darkness [7] Group 3: Successful Recovery - Early on September 12, the team successfully detected the Lander's signal, which was located 272 meters away, but faced concerns about the low battery power of the release device [7][9] - The Lander was eventually recovered successfully at 3:50 AM, marking a triumphant conclusion to the expedition [12]