Soviet scientists at the Kola Institute pursued the goal simultaneously; after 15 years they reached a depth of 12,260 metres (40,220 ft), the world's deepest hole, before abandoning their attempt in 1989.
科拉研究所的苏联科学家同时追求这个目标; 15年后，他们在1989年放弃了他们的尝试之前，已经达到了世界最深的洞穴12,260米（40,220英尺）的深度。