![Aerial photo taken on May 3, 2019 shows the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan\'en County, central China\'s Hubei Province. (Xinhua/Song Wen)](http://www.ecns.cn/hd/2019/05/04/8fda2ba8a43a4427b96fee9ecb3e9cf8.jpg)
Aerial photo taken on May 3, 2019 shows the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)
![Photo taken on May 3, 2019 shows plants at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan\'en County, central China\'s Hubei Province. (Xinhua/Song Wen)](http://www.ecns.cn/hd/2019/05/04/29fde6e9b4584783a260336b5f7623e8.jpg)
Photo taken on May 3, 2019 shows plants at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)
![Photo taken on May 3, 2019 shows plants at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan\'en County, central China\'s Hubei Province. (Xinhua/Song Wen)](http://www.ecns.cn/hd/2019/05/04/8d1e0caf910641179b84dacc866a2bff.jpg)
Photo taken on May 3, 2019 shows plants at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)
![Photo taken on May 3, 2019 shows a sprouting tree at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan\'en County, central China\'s Hubei Province. (Xinhua/Song Wen)](http://www.ecns.cn/hd/2019/05/04/4706e0f0d4eb44aebc2c55f7b1809c55.jpg)
Photo taken on May 3, 2019 shows a sprouting tree at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)
![Photo taken on May 3, 2019 shows a plant at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan\'en County, central China\'s Hubei Province. (Xinhua/Song Wen)](http://www.ecns.cn/hd/2019/05/04/b44dbffb75a9403e8d0356f286cef447.jpg)
Photo taken on May 3, 2019 shows a plant at the bottom of the Luoquanyan sinkhole, which measures 290 meters in depth, in Xuan'en County, central China's Hubei Province. (Xinhua/Song Wen)