1. Geographical Terrain & Oceanic Setting
Middle Button Island National Park covers a land area of 0.64 square kilometers (64 hectares) in the central sector of the Andaman archipelago. Established in 1987 along with its sister sanctuaries—North Button Island and South Button Island—the park was created to protect the exceptional offshore coral formations and associated pelagic marine life that thrive around this isolated limestone islet.
The island itself is an uplifted coral limestone plateau ringed by sharp littoral undercut cliffs and narrow stretches of coarse silica sand beaches. The surrounding marine bathymetry is characterized by extensive fringing reefs that transition abruptly into dramatic submerged walls and pinnacles plunging into depths exceeding 30 meters. These underwater drop-offs are swept by oceanic currents from the Andaman Sea, bringing massive volumes of planktonic nutrients that sustain a hyper-dense coral and fish community.
Middle Button sits in open sea between Swaraj Dweep (Havelock) and the southern tip of Middle Andaman Island. Its isolation shields it from the heavy recreational boat traffic of the main tourist islands, allowing fragile branch corals (Acropora) and giant gorgonian fans to grow undisturbed to colossal proportions.
The seabed geology comprises ancient volcanic basalt bases capped by thick layers of fossilized coral limestone. This rugged underwater topography creates numerous swim-throughs, overhangs, and cavernous recesses where nocturnal fish species like soldierfish, squirrelfish, and lionfish congregate during daylight hours.
2. Terrestrial Ecology & The Spotted Deer Introduction History
The terrestrial interior of Middle Button Island is covered by Deciduous Coastal Forest and Moist Bamboo Brakes. The canopy consists of salt-tolerant littoral hardwoods such as Manilkara littoralis, Calophyllum inophyllum, and Terminalia catappa.
An intriguing historical aspect of the Button Islands is the presence of the Spotted Deer (Axis axis). Originally introduced to the Andaman Islands from mainland India by the British colonial administration in the 1920s as game animals, spotted deer swam across narrow channels and established feral populations across several islands, including Middle Button. Over decades of insular isolation, the deer adapted to feeding on fallen littoral leaves and beach succulents, coexisting with endemic reptiles like the Andaman Water Monitor (Varanus salvator andamanensis) and the Andaman Day Gecko (Phelsuma andamanensis).
Avian life on Middle Button includes breeding colonies of the White-bellied Sea Eagle (Haliaeetus leucogaster), the Andaman Wood Pigeon, the Pacific Reef Heron, and migratory waders that forage along the exposed coral reef flats during low tide.
3. Underwater Topography & Scuba Diving Pinnacles
Middle Button Island is celebrated in the international diving community as one of the premier dive expeditions in the Andaman archipelago, offering pristine underwater visibility ranging from 20 to over 35 meters between December and April.
The Coral Pinnacles
Massive underwater volcanic and limestone pillars rising from a sandy seabed at 28 meters up to 8 meters below the surface, smothered in vibrant purple and yellow soft corals (Dendronephthya).
Pelagic Predators
Schools of Giant Trevally (Caranx ignobilis), Great Barracuda, Dogtooth Tuna, and patrolling White-tip and Grey Reef Sharks hunting along the current-swept outer reef walls.
Manta Rays & Sea Turtles
Manta Rays (Mobula birostris) and Hawksbill Turtles regularly visit cleaning stations on the southern coral ridges where cleaner wrasses service their shells and gills.
Macro Marine Life
A destination for macro photographers: ornate ghost pipefish, pygmy seahorses, harlequin shrimp, and over 40 recorded species of colorful nudibranchs.
During slack tide, divers can explore the eastern reef slope where massive brain corals (Porites lutea) exceeding 4 meters in diameter form subterranean mini-canyons populated by blue-ringed angelfish, regal tangs, and titan triggerfish.
4. Conservation & Protection Protocols
Because Middle Button Island is entirely uninhabited with no freshwater sources, it remains completely free from residential pollution or agricultural runoff. However, the coral reef systems are vulnerable to anchor damage from unauthorized fishing boats and oceanic thermal anomalies associated with El Niño events.
The Department of Environment and Forests, Andaman and Nicobar Administration, conducts periodic sea patrols and strictly regulates boat moorings, requiring all authorized dive vessels to use designated anchor buoys to prevent damage to fragile branching Acropora coral heads.
5. Scuba Dive Expedition Profile & Site Blueprint
For certified scuba divers chartering vessels to Middle Button Island, the primary dive site profile is structured as follows:
Dive Site 1: The South Wall (Depth: 12 – 30 Meters)
A drift dive along a sheer limestone cliff covered in giant sea whips and gorgonian fans. Schooling blue-fin trevally and white-tip reef sharks cruise the deep blue water, while moray eels inhabit crevices in the wall.
Surface Interval: Island Fringing Shallows
Resting in the sheltered bay of Middle Button Island. Observe nesting White-bellied Sea Eagles soaring above the littoral tree line and spotted deer grazing near the beach.
Dive Site 2: The Northern Coral Pinnacle (Depth: 8 – 22 Meters)
A multi-level pinnacle dive showcasing massive table corals (Acropora cytherea), anemone gardens with endemic Clark's anemonefish, and resident Hawksbill sea turtles feeding on sponge formations.
6. How to Reach Middle Button Island & Expedition Logistics
Middle Button Island has no jetty or docking infrastructure. Trips are organized exclusively as day-boat diving expeditions departing from nearby inhabited island hubs.
Departure Points
- From Havelock Island (Swaraj Dweep): Licensed PADI/SSI dive operators in Havelock arrange full-day two-tank dive trips to the Button Islands aboard specialized twin-engine dive catamarans. The boat transit takes approximately 1.5 to 2 hours each way across the open sea.
- From Long Island: Long Island is the geographically closest mainland base (approximately 20 km). Local boatmen at Long Island Jetty operate motorized fiberglass dunghis to the Button Islands under favorable sea conditions with forest department permits.
Best Season to Visit
The diving and expedition season runs from December to April, when the northeast monsoon subsides, the sea becomes calm, and oceanic underwater visibility reaches its peak. Expeditions are suspended during the rough monsoon months between May and October.
7. Frequently Asked Questions
Where is Middle Button Island National Park located?
Middle Button Island is located in the Andaman Sea, situated between Havelock Island (Swaraj Dweep) and Long Island in the North and Middle Andaman district, approximately 60 km northeast of Port Blair.
How can divers and travelers reach Middle Button Island?
Middle Button Island is accessible exclusively by chartered motorized boats (dunghis or private dive catamarans) departing from Havelock Island (Swaraj Dweep), Neil Island (Shaheed Dweep), or Long Island Jetty.
What are the primary marine attractions at Middle Button Island?
The island is renowned for pristine submerged coral pinnacles, steep reef walls dropping to depths of 25 to 30 meters, white-tip reef sharks, manta rays, giant trevallies, and sea turtles.
Is accommodation available on Middle Button Island?
No. Middle Button Island is completely uninhabited with zero infrastructure. Visitors must stay at resorts on Havelock Island, Neil Island, or the Forest Department eco-huts on Long Island.
What is the best season for scuba diving around the Button Islands?
The optimal scuba diving window spans from December to April, when the sea is calm, water visibility exceeds 25 to 35 meters, and pelagic activity around the underwater pinnacles is at its peak.
What coral types are visible around Middle Button Island?
The reefs feature massive Dendronephthya soft corals in vibrant violet and yellow hues, giant seafans (Gorgonians), Acropora table corals, and extensive Porites brain coral heads.
8. Oceanic Currents, Thermocline Dynamics & Dive Safety
The marine environment surrounding Middle Button Island is characterized by vigorous semi-diurnal oceanic tidal currents that sweep between the Andaman Basin and the open Bay of Bengal. Tidal currents through the Button Channel frequently reach speeds of 2 to 3.5 knots, creating exhilarating drift diving conditions along the eastern and southern reef walls.
A distinct thermocline typically develops between 18 and 24 meters depth during the winter months, where ambient water temperatures drop from 29°C at the surface to 26°C below the thermocline. This temperature gradient concentrates schools of pelagic predators—including Dogtooth Tuna (Gymnosarda unicolor), King Mackerel, and Giant Trevally—which actively hunt baitfish schools along the boundary layer.
Dive Expedition Safety Directives
Due to the remote offshore location and absence of mobile cellular connectivity or hyperbaric decompression chambers on nearby islands (the nearest naval hyperbaric facility is situated at INHS Dhanvantari in Port Blair), all divers visiting Middle Button Island must adhere to strict safety protocols:
- Certification Level: Advanced Open Water Diver (AOWD) or equivalent certification with documented deep-sea drift diving experience is strongly recommended.
- Mandatory Safety Gear: Every diver must carry a high-visibility Surface Marker Buoy (SMB), finger spool, dive computer, and audible signaling device (storm whistle or scuba horn).
- Emergency Oxygen & Communications: Authorized dive charter vessels are required by maritime safety regulations to carry dedicated medical oxygen kits, satellite communication beacons, and secondary backup outboard motors.
Geological Evolution of the Button Archipelago
Geologically, the three Button Islands (North, Middle, and South Button) represent emergent karst limestone pinnacles formed through millions of years of coral reef accretion atop tectonic ridge fractures. Submerged sea caves and undercut fissures along the base of Middle Button shelter spiny lobsters, honeycomb moray eels, and rare nocturnal cardinalfishes that avoid daylight predators.
Related Island Sanctuaries & Dive Hubs
Andaman & Nicobar Hub
Comprehensive territory guide covering 572 islands, circuits, and permits.
Havelock (Swaraj Dweep)
Primary departure base for scuba diving and boat expeditions to Button Islands.
South Button National Park
India's smallest national park (0.26 km²), famed for giant clams and reef walls.
All Destinations
Complete directory of national parks, historical monuments, and coral reefs.