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Strong gravitational lensing provides some of the deepest views of theUniverse, enabling studies of high-redshift galaxies only possible withnext-generation facilities without the lensing phenomenon. To date, 21 cm radioemission from neutral hydrogen has only been detected directly out to z~0.2,limited by the sensitivity and instantaneous bandwidth of current radiotelescopes. We discuss how current and future radio interferometers such as theSquare Kilometre Array (SKA) will detect lensed HI emission in individualgalaxies at high redshift. Our calculations rely on a semi-analytic galaxysimulation with realistic HI disks (by size, density profile and rotation), ina cosmological context, combined with general relativistic ray tracing.Wide-field, blind HI surveys with the SKA are predicted to be efficient atdiscovering lensed HI systems, increasingly so at z > 2. This will be enabledby the combination of the magnification boosts, the steepness of the HIluminosity function at the high-mass end, and the fact that the HI spectralline is relatively isolated in frequency. These surveys will simultaneouslyprovide a new technique for foreground lens selection and yield the highestredshift HI emission detections. More near term (and existing) cm-wavefacilities will push the high redshift HI envelope through targeted surveys ofknown lenses.

Strongly lensed neutral hydrogen emission: detection predictions with current and future radio interferometers