This dataset contains turbidity (NTU) data acquired between June 2021 and June 2022 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 2021/06/10 – Nautile Dive 2002 (Momarsat 2021 cruise https://doi.org/10.17600/18001296) Recovery 2022/06/12 – Nautile Dive 2023-03 (Momarsat 2022 cruise http://doi.org/10.17600/18001914)