After some more tweaks I recently deployed the camera in the harbour and left it for  4 days. I removed all the images too dark to immediately see and applied some colour correction. (log about colours coming soon).

Deployment:

• ~4 days (dark photos removed)
• Interval: 4 min
• Location: Harbour, close to locks
• Depth: ~5m

Processing:

• Colour correction: correction script applied
• Frame rate: 5 FPS 
• Number of photos: ~344