  It is well known that waves incident upon a crystal are transported only over
a limited distance - the Bragg length - before being reflected by Bragg
interference. Here, we demonstrate how to send waves much deeper into crystals,
by studying light in exemplary two-dimensional silicon photonic crystals. By
spatially shaping the optical wavefronts, we observe that the intensity of
laterally scattered light, that probes the internal energy density, is enhanced
at a tunable distance away from the front surface. The intensity is up to $100
\times$ enhanced compared to random wavefronts and extends as far as $8 \times$
the Bragg length. Our novel steering of waves inside a forbidden gap exploits
the transport channels induced by unavoidable deviations from perfect
periodicity, here unavoidable fabrication deviations.
