Why not go along with scientists as they explore and survey the deep looking to understand these habitats? Schmidt Ocean livestreams their entire ROV dives (7 hour long livestreams or so usually). It is a blast to watch along or just put in the background as ambiance. The submersible can go down to 4000 meters or so.
Usually a scientist is tasked with explaining to the stream what they are seeing and doing and it is super fun to just be a fly on the wall in the control room of the ROV ship.
Also the ROV camera is extremely high quality with a great zoom, grainy footage this is NOT.