This dataset contains turbidity (NTU) data acquired between October 2020 and May 2021 using a Wetlabs turbidimeter (ECO-BBRTD, serial # 215R) installed horizontally at 1.5 m height at the top of the SeaMoN East frame. The sensor was not calibrated as the sizes of the natural particles are unknown. Data was acquired every 15 minutes. The instrument is part of the SeaMoN East ecological monitoring node deployed at ca 10m away from the active hydrothermal edifice Tour Eiffel. Deployment 2020/09/23 - Victor6000 Dive 761-09 (Momarsat 2020 cruise https://doi.org/10.13155/79497) Recovery 2021/05/28 – Nautile dive  1991-03 (Momarsat 2021 cruise https://doi.org/10.17600/18001296)