  In this letter we study metamaterials made out of resonant electric wires
arranged on a spatial scale much smaller than the free space wavelength and we
show that they present a hybridization band that is insensible to positional
disorder. We experimentally demonstrate defect cavities in disordered and
ordered samples and prove that, analogous to those designed in photonic
crystals, those cavities can present very high quality factors. In addition we
show that they display mode volumes much smaller than a wavelength cube, owing
to the deep subwavelength nature of the unit cell. We underline that this type
of structure can be shrunk down to a period close of a few skin depth. Our
approach paves the way towards the confinement and manipulation of waves at
deep subwavelength scales in both ordered and disordered metamaterials.
