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Fig. 1. ELSA (13°N/EPR), the instrumented chimney where incubators were deployed. (A) Lateral view of the ELSA chimney with its faunal coverage, described according to the dominant species observed on video recordings. Positions of incubators I1, I2 and I3 deployed on the chimney are indicated. (B) Incubator I1 (arrowhead) deployed on oxidised sulphide blocks at the base of the chimney. (C) Close-up view of incubator I2 (arrowhead) inside the Riftia pachyptila clump. (D) Close-up view of the upper part of the chimney with incubator I3 (arrowhead) and the autonomous probe deployment (black arrow).