Night Diving: What to Expect on Your First Time
It's dark, the water is calm, and your torch illuminates a world completely different from the one you know by day. Night diving is an experience like no other, a bit nerve-wracking at first, completely addictive after. It's also one of the most popular adventure dives in the Advanced Open Water course. Here's what to expect.
What is different about diving at night?
Underwater, darkness falls differently. After sunset, visibility decreases gradually and your field of vision shrinks to the beam of your torch. It's disorienting for the first few minutes: you lose your usual reference points, your sense of depth changes, and the silence feels even deeper.
But that's exactly what makes it magical. Your torch acts like a spotlight: everything it hits appears with a clarity and colour you never see during the day. Reds, oranges, purples, colours the water normally absorbs, explode under your beam. It's like discovering a reef for the very first time, even if you've dived it ten times before in daylight.
What marine life can you see on a night dive?
At night, the reef changes owners. Daytime fish hide in crevices to sleep (some parrotfish even secrete a mucus cocoon to protect themselves, which is fascinating to observe). And the nocturnal creatures come out to hunt.
Octopuses are the undisputed stars of night diving. Discreet and shy during the day, they become true predators at night, changing colour right before your eyes. Shrimp and lobsters leave their shelters, sea urchins move about, moray eels prowl. If you're lucky, you'll spot rays hunting just above the sand.
And then there's bioluminescence. Turn off your torch for a few seconds and wave your hand through the water, and you can see thousands of glowing points, bioluminescent plankton lighting up with the movement. It's one of the most magical moments you can experience underwater.
What equipment do you need for a night dive?
On a night dive, your torch is your best friend. You'll have a primary light (powerful, with good battery life) and a backup light (smaller, clipped to your BCD). You never dive at night without a backup light. That's an absolute rule.
You'll also wear a glow stick (cyalume) attached to your tank or BCD. It allows your buddy and instructor to spot you easily in the water. Simple, cheap, and a lifesaver if a torch fails.
How do you communicate underwater at night?
Underwater at night, regular hand signals only work if you illuminate them. Communication is mainly done with the torch. To signal "OK", you trace a circle with the beam. To get someone's attention, you gently sweep their light with yours (never directly in their eyes, that's blinding and unpleasant).
On the surface, to signal your position to the boat, you point your torch upward. These conventions are simple but essential, and they're covered in detail during the pre-dive briefing.
What safety precautions should you take for night diving?
Night diving is ideally done on a site you already know from daytime dives. That eliminates navigation stress and lets you focus on the experience. Stay close to your buddy, watch your air consumption (you tend to use a bit more at night due to the excitement), and never stray from the group.
Most night dives take place at moderate depths (8 to 15 metres) and last 40 to 50 minutes. It's not a deep or extreme dive. It's all about atmosphere and discovery.
Ready to try it?
Night diving is consistently rated as divers' favourite experience, even by those who were most nervous about it. If you're Open Water certified, you can try it as part of your Advanced course, or simply on a guided dive.
Fancy giving it a go? Get in touch, and we'll set it up together.