Researchers published in JGR Planets (2025) created a high-resolution 3D model of Ape Cave, Washington lava tube, simulating gravity anomalies that matched field measurements from five transects; lunar models require 25 μGal resolution for Ape Cave-sized tubes and 100 μGal for larger ones, detecting voids to 26 meters deep[2][1][6].
Lava tubes offer natural shielding from cosmic radiation, extreme temperatures (-173°C to 127°C), and micrometeorites, enabling stable long-term lunar habitation with reduced existential risks from surface hazards; gravity methods from GRAIL GRGM1200B data identify candidates near sinuous rilles and skylights[2][3][4].
Ark team should integrate gravity sensor data from LunarLeaper-like missions with GPR for tube confirmation, prioritize mapping Mare Tranquillitatis and Marius Hills candidates, and model structural integrity for 1000-year habitat viability[5][1][3].