  We estimate the sensitivity of a lander-based instrument for the passive
radio detection of a subsurface ocean beneath the ice shell of Europa, expected
to be between 3~km - 30~km thick, using Jupiter's decametric radiation. A
passive technique was previously studied for an orbiter. Using passive
detection in a lander platform provides a point measurement with significant
improvements due to largely reduced losses from surface roughness effects,
longer integration times, and diminished dispersion due to ionospheric effects
allowing operation at lower frequencies and a wider band. A passive sounder
on-board a lander provides a low resource instrument sensitive to subsurface
ocean at Europa up to depths of 6.9~km for high loss ice (16 dB/km two-way
attenuation rate) and 69~km for pure ice (1.6 dB/km).
