xperimentally, excess heat, Qx, and 4He are the measured fusion products of transient high-density sonofusion, SF. A possible path to DD fusion is explained by piezo driven cavitation bubbles, where the critical parameters are temperature, pressure, acoustic input, and frequency that control, for a picosecond, the low-energy nuclear reactions that produce DD fusion events. The electromagnetic, EM, pulse compressed deuteron clusters squeezing them into a Bose Einstein Condensate. The BEC cluster environment provides for the direct conversion of fusion energy into heat and 4He. The continuous production of 1016 bubbles/sec produces radiation free usable heat as observed via ejecta site surveys.