Plankton and the night sea
Tiny drifting organisms make night water surprisingly alive.
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
Use a narrow light beam sparingly and avoid dazzling your buddy. Plankton concentrations can attract feeding animals, while suspended particles make backscatter and visual distance harder to judge.
A practical approach
Agree close-contact signals, use a backup light and keep the return route simple when the water fills with particles.
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.