Lembeh Strait: A Masterclass in Muck Diving

In this article from The Underwater Photography Show, we'll be discussing how to make the most of your time diving in the Lembeh Strait. The Lembeh Strait remains one of the most remarkable diving destinations in the world, and returning for a 150th workshop provided a fresh perspective on the gear, techniques, and biodiversity that make this Indonesian gem so unique. Whether you are a seasoned muck diver or planning your first trip, the following insights from my (Alex) last Lembeh workshop highlight the evolving nature of underwater photography in the Strait.

Refining Buoyancy and Gear Dynamics

Muck diving requires a specific approach to buoyancy to protect the delicate seabed while achieving the best angles.

• Negative Buoyancy: Diving with a slightly negatively buoyant housing allows the camera to pull the front of the body down, naturally keeping your legs floating upward and away from the silt.

• Weighting: I aim to be slightly underweighted personally so that me and my camera system together become perfectly neutral.

• Physical Sustainability: While a heavy camera helps with positioning, it can lead to tendon strain in the hands and shoulders over a long trip. I found that adding a touch of buoyancy back to the housing midway through the trip helped alleviate physical fatigue.

The Evolution of Lembeh Diving

While there are now between 30 and 40 different resorts and liveaboards operating in Lembeh, the quality of diving has remained consistently high for nearly 30 years.

• The "A-List" Diversity: During my recent workshop, the group recorded 305 "A-list" species—specialized critters that dive guides prioritize for photographers.

• Guide Expertise: Modern dive guides are more educated than ever. In the past, divers often swam over tiny species that today's guides find with ease, such as Denise pygmy seahorses and various rare nudibranchs.

• Habitat Variety: Lembeh is more than just black sand. To see the full diversity of the Strait, you must visit different habitats, including:

  • Silty black sand and coarse volcanic sand.

  • Rubble slopes and boulder fields (favored by Blue-ringed octopuses).

  • Proper reef walls and human-influenced habitats around moored boats.

Behavior and Critter Highlights

The Strait continues to surprise even the most experienced divers with rare behaviors and species sightings.

• Blue-ringed Octopus: We witnessed a rare event where three males were competing for a single female. Other groups have observed females "standing" on bottles while releasing hatchlings into the water.

• Predatory Interactions: Notable sightings included a crab predating a living Randall’s frogfish and a pufferfish being pulled into the sand by a buried predator.

• Rare Finds: Hairy octopuses were spotted across four different dive sites, and resident Rhinopias continue to be found, sometimes at unusually shallow depths of around 9 meters.

• Mass Spawning: We recorded 25 different species of coral spawning over several nights, along with sponges spawning at dawn.

Essential Macro Photography Toolkits

To maximize your results in Lembeh, we recommend a diverse range of accessories and a thoughtful approach to lighting.

• Lens Selection: While the 90mm (full frame) remains the "workhorse" of muck diving, do not rely on it exclusively. Wider macro lenses (30mm or 45mm) are often better for larger subjects or environmental shots.

• Neutral Density (ND) Filters: These are invaluable for achieving a shallow depth of field in tropical ambient light. An ND filter allows you to shoot at wide apertures (like f/4) without overexposing the background.

• Lighting Control: * The MFO3: Currently the most valuable accessory for Lembeh, effectively allowing you to "change lenses" underwater.

  • Snoots and Beam Restrictors: Essential for shaping light and isolating subjects.

  • Single Strobe Technique: We strongly encourage shooting macro with a single strobe to create more dynamic, controlled lighting.

To see the full episode, check it out below: