This dataset contains turbidity (NTU) data acquired between June 2019 and October 2020 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 2019/06/27 - Nautile dive Dive 1953-15 (Momarsat 2019 cruise https://doi.org/10.17600/18001110) Recovery 2020/06/15 – Victor6000 dive 755-03 (Momarsat 2020 cruise https://doi.org/10.17600/18000684)