LONDON (REUTERS).- Derelict oil tanks and forgotten industrial spaces hidden in the bowels of the Tate Modern art museum in London will open to the public in summer 2012, providing a new area to “revolutionise” the museum’s work, directors said on Thursday. The opening of the enormous and atmospheric oil tanks in the former power station on the banks of the Thames will provide flexible, subterranean “lunar” spaces and form the foundation for a further expansion of the world’s most visited modern art museum. The expansion will also include a new 64-metre high building and is set to be completed in 2016. “The oil tanks will give visitors a new way to explore and experience art at Tate Modern. Architecturally they are fantastic raw spaces, which are being carefully converted for public use without losing any of their unique industrial character,” Tate Modern Director Chris Dercon said. This completed space