Reading sunlight underwater
Light changes the colour and contrast of a reef throughout the day.
Safety and training
General field notes, not a dive plan. Stay within your training, follow local site rules and the operator’s briefing.
Field observation
Low sun can silhouette a subject; a high sun lights the shallows more evenly. Depth absorbs warm colours, so a camera's automatic setting may misrepresent what your eyes saw.
A practical approach
Position without touching the reef, adjust exposure in open water and never chase a shot beyond gas or time limits.
Dive-day checklist
Before you go
- Check local conditions and access rules
- Agree limits and the exit with your buddy
- Stop or change the plan if conditions differ
General guidance only. Follow your training, the dive operator’s procedures, and each manufacturer’s current instructions.
Ask the dive guide
Personal guidance for your next dive
Describe a dive scenario or an equipment-care question. The guide answers in your language and points you to relevant journal articles.
General educational guidance only. It is not medical advice, emergency instruction or a replacement for training, certification, manufacturer instructions, your operator's briefing or your dive plan.