This dataset contains video data and snapshots acquired with the camera SMOOVE installed on the TEMPO ecological module (Sarrazin et al. 2007), deployed on the EMSO-Azores observatory from 23/06/2022 to 07/07/2023. Data consist in: - 50 weekly snapshots (Size: 480 x 360 pixels). Note that the luminosity decreased from the first snapshot (23/06/2022) to the others and that they were acquired more randomly from April 2023 to the end. - 52 1-minute video sequences (Size: 1920 x 1080 pixels). Note that the luminosity decreased from the first sequence (23/06/2022) to the others and that they were acquired more randomly from 21/04/2023 to the end (3 missing files). 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