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Strain EECR1B, colloquially named "Blue Point" due to its distinctive cobalt-blue pigmentation under anaerobic electron-donating conditions, was isolated from a hydrothermal vent in the Pacific’s Pescadero Basin . This paper reports on its extraordinary dual capability: (1) direct extracellular electron transfer (EET) to solid-state electrodes at rates exceeding known Geobacter species, and (2) a novel, cryptic sulfur reduction pathway that operates only under high hydrostatic pressure. EECR1B challenges the current dichotomy between electrogenic bacteria and chemolithotrophic archaea, offering a new chassis for bioelectrochemical systems in extreme environments.

Electroarchaea, Blue Pigmentation, Cryptic Sulfur Cycle, Hadal Biosphere, Bioelectrochemical Pulse Effect. blue point eecr1b

Authors: A. Marin, K. Deep-Sea & J. Vent Affiliation: Institute of Extreme Biogeochemistry, Hadal Observatory Strain EECR1B, colloquially named "Blue Point" due to