ESA's Mars Express HRSC imagery of Shalbatana Vallis reveals catastrophic groundwater outbursts around 3.5 billion years ago that carved a 1300 km channel system, yet the coverage underplays integration with MRO CRISM spectra detecting phyllosilicates and hydrated sulfates along the valley margins. These minerals, formed in sustained water-rock interactions, align with Noachian climate models showing episodic warming that could sustain a northern ocean in Chryse Planitia for millennia. Original reporting overlooks how chaotic terrain collapse patterns here mirror Iani Chaos and Hydraotes Chaos, suggesting repeated aquifer breaches tied to volcanic heating rather than single events. Synthesizing Mars Express topography with a 2021 peer-reviewed Icarus study (Baker et al., n=47 mapped outflow channels) and 2023 Nature Geoscience analysis of Perseverance delta deposits indicates this region preserves high-priority biosignature sites where flood sediments could entomb organics. Limitations include reliance on orbital resolution (>10 m/pixel) that misses meter-scale features later targeted by rovers, plus potential overestimation of ocean volume without in-situ ground truth. This evidence shifts mission priorities toward Shalbatana-adjacent landing ellipses for direct sampling of ancient habitable environments.