This project is part of an ecological investigation into the resonance of testosterone-HRT transitioned voices with the shifting earth. Recording with a geophone in geothermal hot spots along the Mid-Atlantic Ridge, I have been developing subfrequency vocal techniques in conversation with the tones, moans and harmonic rumbling heard from listening to each of the pools. Shifting between moments of resonance found between these active and passive bodies, I have treated pool as a verb - to reciprocate substance and vibration in a harboured space between two bodies or forces.