My suggestion is to use the lumen subsea light case with a clear lens for an external FPV style, USB camera…
The camera could be used for:
- real-time ROV selfie type shots
- point straight down stitch shots together of the sea bed.
- Point straight up for cinematic surface type shots
My understanding is that the cable length would be fine.
You could also provide a ‘bar’ of known length where 2 such cameras could be used for photogrammetry applications.