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从1977年到1984年，联邦德国在烟煤岩层和岩盐中共钻了13口水平深孔，其中900m以上的有7口，烟煤岩层中的最深水平孔的孔深为1770.3m，岩盐中的最深水平孔深达1521.65m。烟煤岩层的钻进主要服务于矿山开采范围内的勘探，即通过在坑道内钻水平深孔来了解大部分地质情况尚不清楚的地层，为开采方式的确定和长期开采计划的制定提供依据。岩盐中的水平孔用于埋放核废料。这两个钻进项目都属于德意志联邦科技部的科研项目，除了服务于上述目的外，它们的另一个目的是使水平深孔钻进技术得到发展。
From 1977 to 1984, a total of 13 horizontal deep holes were drilled in the bituminous coal and rock salt in the Federal Republic of Germany, of which 7 were above 900 m and the deepest horizontal holes in bituminous coal were 1770.3 m deep. The deepest level in rock salt Hole deep 1521.65m. The drilling of bituminous coal beds mainly serves for exploration within the scope of mine exploitation. That is, most of the formations whose geological conditions are not clear are known by drilling horizontal deep holes in the tunnels, which provides the basis for the determination of mining methods and the formulation of long-term exploitation plans. Horizontal holes in rock salt are used to deposit nuclear waste. Both of these drilling projects are part of the scientific project of the Federal Ministry of Science and Technology in Germany. In addition to serving the above objectives, their other purpose is to develop horizontal deep hole drilling techniques.