This dataset contains video data acquired with the camera SMOOVE installed on the TEMPO ecological module (Sarrazin et al. 2007), deployed on the EMSO-Azores observatory from 26/07/2023 to 07/08/2024. Data consist in: - 55 10-minutes video sequences (Size: 1920 x 1080 pixels). Note that six files are a little less than 10 minutes. The module is connected to the SEAMON East environmental monitoring node and films a Bathymodiolus azoricus mussel assemblage located at the base of the active Tour Eiffel edifice at 1695 m depth since 2010. Position : Latitude 37° 17.334' N, Longitude 32° 16.534' W