This session at the Geothermal Energy Program Review X: Geothermal Energy and the Utility Market consisted of five presentations: 'Hard Rock Penetration - Summary' by George P. Tennyson, Jr.; 'Overview - Hard Rock Penetration' by James C. Dunn; 'An Overview of Acoustic Telemetry' by Douglas S. Drumheller; 'Lost Circulation Technology Development Status' by David A. Glowka; 'Downhole Memory-Logging Tools' by Peter Lysne.