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.
2009 LEGO Sets
In 2009, LEGO Star Wars celebrated its 10th Anniversary with the release of its 10th Anniversary sets. But even more important, LEGO celebrated its 50th anniversary of the LEGO Brick. A number of new themes were first introduced including BIONICLE Glatorian, Space Police III, Power Miners, Agents 2.0 and LEGO Pirates was re-introduced. Some themes that were retired in 2009 by LEGO included Mars Mission, the original and highly collectable Batman sets. Exo-Force and Belville where also discontinued in 2009.