Power Miners was a LEGO theme released in 2009 and was the successor to Rock Raiders and was generally set in underground caverns. Two generations of the theme were released, in the first generation, Power Miners are deep in the crust of the Earth where they fight the Rock Monsters. In the second generation, Power Miners have drilled into the volcanic recesses of the Earth's core where team faces the Lava Monsters. The theme was discontinued in 2010.