Dive Site: Anilao — Secret Bay

About Anilao — Secret Bay

Secret Bay, nestled within Anilao in the Philippines, is renowned globally as a premier muck diving destination. Its protected waters and unique sandy-silt bottom create an ideal habitat for an extraordinary array of macro marine life, making it a favorite for underwater photographers. The site's diverse topography, ranging from gentle slopes to areas with geothermal activity, hosts species often unseen elsewhere. Diving here typically involves exploring depths between 6 and 18 meters, where the focus is on spotting intricate details rather than expansive coral reefs. The relatively calm conditions and mild currents throughout much of the year contribute to comfortable diving, allowing for extended observation of the fascinating creatures. While the primary draw is its exceptional macro biodiversity, the site also benefits from Anilao's general abundance of marine life, including various nudibranchs, frogfish, and cephalopods. The consistent water temperatures, usually between 27-30°C, ensure a pleasant diving experience almost year-round. Access to Secret Bay is convenient, with options for both boat and shore entries, depending on the operator. This flexibility, combined with its suitability for beginner to intermediate divers, makes it an accessible and rewarding location for those passionate about discovering the subtle beauty of the marine ecosystem.

Dive site facts: Anilao — Secret Bay

Depth

6–18 m

Typical dive

12 m, 50–60 min

Current

Mild

Visibility

10–25 m

Water temperature

27–30°C

Entry

Boat / Shore

Level

OWD

Dive type

Macro, muck

Night dive

Possible

Region / port

Anilao, Batangas

Coordinates

13.754, 120.892

Conditions & Currents

Secret Bay generally experiences mild currents, which is advantageous for macro photography and close observation of marine life. However, divers should always heed local tide charts and guide briefings, as currents can vary and influence dive planning and entry/exit procedures. The site's sandy substrate means visibility can be affected by disturbed sediment, emphasizing the importance of excellent buoyancy control. While the current is typically gentle, it is essential to follow the guidance of the dive captain and guide, especially for boat entries and exits, to ensure a safe and enjoyable experience.

Marine life & sighting chances

Nudibranch

common

Flamboyant cuttlefish

occasional

Mimic octopus

occasional

Hairy frogfish

occasional

Pegasus seamoth

occasional

Thorny seahorse

occasional

Whip coral goby

occasional

Thecacera nudibranch

occasional

Blue-ringed octopus

occasional

Wonderpus

occasional

Dive profile & how the dive runs

Diving at Secret Bay typically begins with either a boat drop or a shore entry, descending onto a gently sloping sand-silt bottom. The dive focuses on a shallow to medium depth, generally staying between 6 and 18 meters, to maximize bottom time for macro critter hunting. Divers systematically scan the substrate and small patches of coral or debris, often moving slowly against a mild current to cover ground effectively. The route involves traversing the bay, meticulously searching for camouflaged or rare creatures. Turnaround is usually determined by air consumption or guide discretion, leading back towards the entry point or a designated exit. Safety stops are conducted in the shallowest part of the bay, observing any final macro subjects.

Underwater photography

Secret Bay is a macro photographer's dream, requiring specific gear and techniques to capture its tiny inhabitants. A macro lens (e.g., 60mm or 100/105mm) is essential, often paired with diopters for extreme close-ups of nudibranchs, frogfish, and pipefish. Twin strobes are highly recommended for even lighting and to minimize backscatter from the silty bottom. A snoot can be particularly effective for isolating subjects and creating dramatic lighting effects. Excellent buoyancy control is paramount to avoid disturbing the fine sediment and to maintain position while composing shots. Patience is key, as many creatures are well-camouflaged, and ethical photography involves minimal disturbance to the marine life.

Combine with nearby dive sites

• Verde Island Passage

  The Verde Island Passage, nestled between Luzon and Mindoro, is celebrated worldwide as the "center of the center of marine shorefish…

• Apo Island

  Apo Island, located in the central Visayas region of the Philippines, is a globally recognized marine sanctuary celebrated for its…

• Dauin — Atmosphere House Reef

  Atmosphere House Reef is a renowned dive site located in Dauin, Philippines, directly accessible from the shore.

• Puerto Galera — Canyons

  Puerto Galera's Canyons offers an action-packed dive through three distinct canyons, renowned for schooling pelagic species like trevally…

Getting there & logistics

Anilao is approximately a three-hour drive south of Manila, located on the island of Luzon in Batangas province. International travelers typically fly into Ninoy Aquino International Airport (MNL) in Manila. From there, transfers to Anilao resorts are commonly arranged via private car or shuttle services. Dive trips to Secret Bay are usually day trips from local resorts, often combined with other nearby Anilao sites due to short boat rides. While no specific park fees are mentioned for Secret Bay, divers should anticipate general dive fees and charges from their chosen resort or operator. Most dive packages include transfers, accommodations, and guided dives.

Safety & environment

While Secret Bay is generally a beginner-friendly site, divers should always prioritize safety. The nearest recompression chamber is typically in Batangas City or Manila, emphasizing the importance of conservative dive planning and maintaining adequate insurance coverage. DAN (Divers Alert Network) insurance is highly recommended for all divers. Site-specific hazards include potential for sediment disturbance affecting visibility, so excellent buoyancy control is crucial. Although currents are mild, all divers should pay close attention to guide briefings regarding entry, exit, and potential current changes. Occasionally, minor seismic tremors have been reported in the region, which, while usually harmless, remind divers to remain vigilant and follow emergency protocols.

Who it suits — and who it doesn't

FAQ

Anilao — Secret Bay FAQ

Liveaboards diving Anilao — Secret Bay

These liveaboards may visit Anilao — Secret Bay on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Infiniti

Philippines

25 guests39 m

$280/day

Seadoors

Philippines

16 guests25 m

$335/day

Resolute

Philippines

16 guests34.6 m

$314/day

Dolphin

Philippines

18 guests31 m

$326/day

Navis 1

Philippines

22 guests23 m

$250/day

Philippine Siren

Philippines

16 guests

$309/day

Palau Sport

Philippines

24 guests38.35 m

$215/day

Philippines Aggressor

Philippines

26 guests42.7 m

$381/day

Stella Maris Explorer

Philippines

20 guests33 m

$398/day

Solitude One

Philippines

24 guests52 m

$460/day

Atlantis Adventurer

Philippines

16 guests32.5 m

$421/day

Philippines Aggressor II

Philippines

26 guests42.7 m

$247/day