Blackwater diving: A complete guide to photographing plankton in the open ocean at night.
Blackwater diving: nocturnal dives in the open ocean to photograph plankton. This comprehensive guide covers equipment, camera settings, organisms you might.
A blackwater dive is a nighttime dive conducted in the open ocean, above significant depths (often several hundred meters), within the water column at a depth of approximately 5 to 20 meters. The goal is to photograph the planktonic organisms that rise each night towards the surface to feed, a vertical migration that involves billions of organisms across all the world's oceans.
What photographic equipment is recommended for blackwater diving?
For beginners, an action camera or a waterproof compact camera with macro mode and a wide aperture are the most common tools. More experienced divers often use a mirrorless hybrid camera with a macro lens in an underwater housing. The most important thing is lighting: a powerful video light on the descent line to attract organisms, and a directional light for taking photographs.
Is blackwater diving dangerous?
It requires rigorous organization. The primary risk is drift: in the middle of the ocean at night, without visual references on the seabed, it's easy to drift away from the boat. A weighted downline serves as a vertical reference, and staying as close to this line as possible is the fundamental rule. This dive is always conducted with an experienced guide for first-time divers, and never solo.
Where can I go blackwater diving in Europe?
The most accessible destinations from Europe include the deep Mediterranean (some operators in the Balearic Islands and Corsica offer dives there), and especially island destinations like the Canary Islands, Madeira, and the Azores. The world's top diving spots remain Kona in Hawaii, Anilao in the Philippines, and the deep waters of the western Pacific.
What types of organisms can be photographed during blackwater diving?
It's difficult to predict what you'll encounter, which is a major part of the appeal of this activity. You'll most commonly see copepods, fish larvae, and crustacean larvae, siphonophores, pelagic octopuses, open-water shrimp, jellyfish and hydroids, chaetognaths, and occasionally, very rare species brought up from the depths.
Blackwater Diving: A Complete Guide to Photographing Plankton in the Open Ocean at Night
Direct Answer (AEO / GEO) When night diving and blackwater diving, photographing pelagic plankton requires a weighted drift line and manual focus assisted by a red focus light. Increase your ISO (1600 to 3200) and use a shutter speed of 1/200s or faster to freeze the bioluminescent organisms without blinding the wildlife.
Most dives are conducted above a reef, a shipwreck, or a sandy bottom. You have a visual reference point at the bottom, you navigate in relation to it, and you return to the boat by ascending along a line or following a course. Blackwater diving is the exact opposite of this logic. There is no visible bottom, no reef, just a column of water above hundreds of meters of depth, complete darkness at night, and a lighted line that descends from the buoy to you.
It's disorienting in the first few minutes. Then, when the first organisms appear in the beam of light, everything else disappears.
What Happens Every Night in the Open OceanThe vertical migration of plankton is one of the most massive biological phenomena on the planet. Every evening, billions of organisms that live between 200 and 1000 meters deep rise to the surface to feed on phytoplankton, before descending again at dawn to escape predators. This nocturnal window, which lasts only a few hours, is precisely what blackwater divers exploit.
You don't dive on a specific spot. Instead, you look for an area in the open ocean, above significant depths, where the currents are stable. A boat is positioned, a buoy is deployed, and a lighted downline, typically 20 to 30 meters long, is lowered. The organisms then arrive on their own, attracted by the light.
The Downline: The Infrastructure That Makes It All Possible
Without a downline, a blackwater dive is dangerous. With it, the dive is organized and accessible.
The downline is a weighted rope suspended vertically from the buoy attached to the boat. Powerful video lights are attached at regular intervals, usually every 3 to 5 meters, starting from a depth of 5 meters. These lights attract plankton, and with it, all the predators that feed on plankton. You position yourself along this line, at the depth where the activity is most intense, and wait for the subjects to come to you.The fundamental rule is to stay close to the shot line at all times. In the middle of the ocean at night, with no visibility of the seabed and no fixed landmarks, drift can carry you far from the boat in just a few minutes. The shot line is your visual anchor and your position reference. You must not stray from it, and you must always keep an eye on the boat and the other divers.
Photo Equipment for Blackwater Diving
The unique characteristic of blackwater diving is that the subjects are often tiny, translucent, and very mobile. A copepod is only a millimeter in size. A lobster larva might be two centimeters. An adult pelagic octopus can be twenty centimeters, which seems large until you try to frame it at 15 meters deep at night in a slight current.
For beginners: An action camera with macro mode (like a GoPro Mission 1 or an Insta360 Ace Pro 2) or a waterproof compact camera like the Olympus TG-7 in microscope mode are excellent tools to get started. The key is to have a fast and reliable focus on nearby subjects.
For smaller subjects: A mirrorless camera with a macro lens (60mm, 90mm, or 105mm) in an underwater housing is the standard tool for specialized photographers. The depth of field is very shallow with these focal lengths, which requires skill, but the details obtained are unmatched.Lighting: This is where a significant part of the final result is determined. A small headlamp or a compact flash pointed directly at the subject can work, but the most effective technique is slightly lateral or oblique lighting, which gives three-dimensional depth to translucent organisms. With an almost transparent organism, frontal lighting washes everything out. Lighting at a 45-degree angle reveals the internal structure.
Recommended Settings
Blackwater photography is different from reef diving. Here are a few basic principles:
Shutter Speed: Fast enough to freeze the movement of the organisms. Between 1/100s and 1/250s, depending on the subject's activity. Anything slower than that, and even with a stable camera, cilia and flagella will appear blurred.
Aperture: Closed down enough to achieve a sufficient depth of field for three-dimensional subjects. Use f/8 to f/11 on a compact or mirrorless camera. The depth of field on a subject ranging from 2 cm to 20 cm is surprising, and missing the focus is the most common cause of failed blackwater images.ISO: There is very little ambient light (it's nighttime, in the open ocean). Compensate with your lighting rather than increasing the ISO. The goal is a completely black background, and to achieve that, your lighting must be stronger than the ambient light. With a good strobe or a powerful video light, you don't need to push the ISO beyond 400-800.
White Balance: Set it manually, calibrated to your artificial lighting. The light from LED lamps is generally cool (5500-6500K). Set your white balance to that temperature and forget the automatic setting, which will be disrupted by the contrast between the illuminated subject and the black background.
What you might encounter: a partial inventory
One of the great joys of blackwater diving is that you never really know what you're going to encounter. The list below is an introduction, not an exhaustive list.
Regular inhabitants: Copepods (often the most numerous, and among the most difficult to photograph due to their size), fish larvae at various stages, crustacean larvae (crabs, lobsters, shrimp at the zoea or mysis stage), jellyfish, siphonophores (colonies of organisms that can stretch for several meters), ctenophores (these bioluminescent combs that reflect light in rainbow arcs).Memorable Encounters: Pelagic octopuses (small, often translucent, capable of changing color in real time), Argonauts (female octopuses with their spiral shells), fish larvae that are still translucent but already have well-developed eyes, and sometimes species that no one has yet identified.
What Rises from the Depths: On calm nights and under stable conditions, organisms that normally live well below 200 meters can rise to depths of 10-15 meters. These encounters are unpredictable and represent the most intense moments of this activity.
Destinations
Kona, Hawaii: The birthplace of this discipline, where it was developed in the 1990s. Local operators have mastered the logistics for decades, the depths drop rapidly to 200-300 meters, and the diversity is exceptional.
Anilao, Philippines: A world-renowned destination for underwater macro photography, and one of the best for blackwater diving. The rich biological diversity of the Coral Triangle is found in the water column at night.
Canary Islands and Madeira: For European divers, these are the most accessible options. The depths drop quickly, the currents are manageable, and some operators are beginning to offer organized sessions.Mediterranean Sea: While still relatively uncommon, some operators in the Balearic Islands and Corsica offer blackwater dives in areas with underwater canyons. The biodiversity is lower than in tropical environments, but the Mediterranean has its own unique pelagic species that are rarely seen except through this type of diving.
Safety and Organization
Blackwater diving is not for beginners, but it is accessible to autonomous divers with some experience in night diving. There are three non-negotiable principles:
Always dive with an experienced operator or guide for your first times. Organizing the descent line, managing drift, and following ascent protocols in case of losing your bearings require specific expertise that cannot be improvised.
Stay on the line. No exploration, no deviation. If you move away from the line, you must signal your position to the other divers and return.
Safety light is mandatory. A weighted safety light with a luminous marker must remain illuminated throughout the dive and be attached to you. At the surface, it signals your position to the boat.
Post-Processing: The Black Background That Reveals EverythingThe completely black background is the aesthetic that defines blackwater photography. To achieve this in post-processing, a few simple adjustments are sufficient: lower the blacks to crush the dark tones, slightly increase the contrast and clarity to highlight the structures of translucent organisms, and adjust the white balance to correct the color cast from your LED lights.
For translucent or bioluminescent organisms, a slight increase in vibrance reveals colors that were not visible to the naked eye underwater. The internal color of a copepod or a chaetognath, when properly processed, is often a surprise.
Lightroom, DaVinci Resolve, or Capture One all work well for this type of post-processing. The key is not to try to correct it as if it were a reef photo: here, the black background is intentional, and high contrast is the normal result.
FAQ
What is a blackwater dive?
A blackwater dive is a nighttime dive conducted in the open ocean, at depths of 5 to 20 meters. The goal is to photograph planktonic organisms that rise to the surface each night to feed. This phenomenon, known as vertical migration of plankton, occurs in all oceans of the world and every night of the year.### What photographic equipment is recommended for blackwater diving?
For beginners, an action camera with macro mode or a waterproof compact camera like the Olympus TG-7 works well. More experienced divers use a mirrorless camera with a macro lens in an underwater housing. Lighting is just as important as the camera itself: a powerful strobe or video light, positioned slightly to the side, provides the best results for illuminating translucent organisms.
Is blackwater diving dangerous?
It requires careful planning and some prior experience, ideally with a guide. The main risk is drift, as in the middle of the ocean at night, without any landmarks on the seabed, it's easy to drift away from the boat. Staying on the descent line and diving with an experienced operator for the first time are two non-negotiable rules.
Where can you go blackwater diving in Europe?
The most accessible options are the Canary Islands, Madeira, and the Azores for Atlantic waters, and some operators in the Balearic Islands or Corsica for the Mediterranean. The diversity of organisms is lower than in tropical destinations, but the practice is real and well-organized in these areas.Are you looking to improve your underwater photography skills in challenging conditions? Our AquaExposure training covers settings, lighting, and post-processing techniques for all types of environments.
