This submission presents a methodological critique of the standard interpretation of submerged atomic clock experiments, arguing that confining timing photons to vacuum chambers excludes the very medium the experiment claims to be irrelevant. The persistent need for continuous GPS satellite clock corrections, despite pre-launch relativistic calibration, is noted as an open question consistent with —but not proving— environmental influences on timekeeping. A falsifiable three-depth experiment is proposed in which timing photons explicitly traverse the water column, and a phenomenological saturation model derived from the UAT framework provides quantitative sensitivity benchmarks (~5 ns differential residual, SNR ~1.4×10⁶ with current optical clocks). The submission makes no claim of new physics; it proposes an empirical measurement to determine whether an unmodeled residual exists beyond General Relativity and classical optics. The package includes the theoretical manuscript (LaTeX) and the analytical simulation script (Python) that generates all quantitative estimates.