People stand next to a 24.9 metre (82 feet) diametre pit at a village in Guangyuan, Sichuan province, February 28, 2013. According to local media the pit formed on a karst landform last year after the ground surface kept sinking for six days in September. The investigators said the pit may face further sinking after rains due to its geological conditions. Picture taken February 28, 2013. REUTERS/Stringer (CHINA – Tags: SOCIETY ENVIRONMENT) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA – RTR3EFC1