This arXiv preprint (not yet peer-reviewed) presents a reduced-order model of hammer-chamber dynamics validated against benchtop percussion tests, followed by drilling trials on two Martian rock simulants: weaker sandstone and stronger Saddleback basalt. The wireline system uses atmospheric CO2 for both actuation and cuttings transport in a compact bottom-hole assembly, achieving mechanical specific energies of 74-360 MJ/m³ with percussion-dominant performance when bit geometry matches impact energy. Methodology relies on controlled lab conditions rather than Mars analog environments or flight hardware, with no reported statistical sample size beyond 'repeatable' impacts, leaving open questions on long-term valve reliability and cuttings transport efficiency at depth. The work advances prior concepts like the Mars 2020 drill by targeting volatile-rich horizons beyond shallow reach, yet underplays integration risks with existing rover power budgets and thermal extremes that doomed the InSight mole's hammering attempts (NASA/JPL reports, 2022). A related 2023 study in Planetary and Space Science on rotary-percussive systems highlights how dust abrasion in real Martian regolith can degrade pneumatic seals far faster than lab simulants predict, an issue this model does not simulate. The tangible 'digging' progress is real, but the architecture's low-power promise hinges on untested full-system autonomy, risking another subsurface access setback if robustness gaps persist.