Deep tech is the underground face of tech house: darker, more stripped-back, a hypnotic bassline and percussion that rolls on and on. The sound of basements and afters, the kind that takes its time. A sharp section for DJs who build the night. Here, we select often underground pressings, by ear and not by name. We keep what holds up over a long set. Listen to the previews on the page: deep tech is judged over the long haul.