Dive Site: Mount Serua

About Mount Serua

Mount Serua is a highlight of the Forgotten Islands, an arc of remote, volcanic atolls in the Southern Maluku region of Indonesia. This dive site is known for its deep-water upwellings that bring nutrient-rich waters to the surface, attracting large pelagic species. The underwater topography consists of dramatic walls and seamounts rising from the deep abyss. These features provide a perfect environment for pelagic action and host pristine coral reefs, offering excellent visibility due to the area's isolation. While the entire Banda Sea is a marine biodiversity hotspot, Serua is specifically recognized for its seasonal hammerhead shark sightings, particularly in the "hammerhead window" months. Divers can also expect to see a variety of other large fish, sponges, and vibrant corals. Given its remote location and potential for strong currents, Serua is exclusively accessible by liveaboard. Dives here are often exhilarating drift dives, showcasing the raw, untouched nature of the Banda Sea's marine ecosystem.

Dive site facts: Mount Serua

Current

Variable, can be strong

Visibility

30–50 m

Water temperature

25–29°C

Entry

Liveaboard tender / negative entry common

Level

Advanced Open Water (AOWD) with current experience

Dive type

Wall, seamount, pelagic encounters

Region / port

Banda Sea, Forgotten Islands

Coordinates

6.3400° S, 130.0100° E

Conditions & Currents

Currents at Mount Serua are variable and can range from mild to strong, depending on the lunar cycle and specific location around the seamount. The site is characterized by significant deep-water upwellings, which are responsible for attracting large pelagic species but also contribute to the current strength. Divers should be prepared for dynamic conditions and potential drift dives, especially when encountering schooling hammerheads drawn to these nutrient-rich flows. Entry techniques often involve negative entry to quickly descend to the desired depth. Good buoyancy control and current experience are essential, as the exhilarating dives can involve swimming against or riding strong flows. Visibility is generally excellent, often exceeding 30 meters, which is crucial for spotting pelagics in these conditions, and thermoclines bringing cooler water from the deep are common, especially d

Marine life & sighting chances

Scalloped hammerhead shark

October-November · common

Barracuda

common

Reef shark

common

Tuna

common

Manta ray

occasional

Mobula ray

occasional

Whale

October-November · occasional

Dolphin

common

Grouper

common

Sea snake

occasional

Hard coral

common

Soft coral

common

Sea fan

common

Sponge

common

Dive profile & how the dive runs

Dives at Mount Serua typically begin with a negative entry from a liveaboard tender to quickly descend into the blue, aiming to catch sight of schooling pelagics. Divers usually follow the current along deep walls or around the seamount, paying close attention to the open water for hammerhead sharks, which are often found deeper, between 20-30 meters. The presence of strong, nutrient-rich upwellings means the dive often becomes a drift, covering significant distance along the pristine coral formations. Bottom times are dictated by air consumption and no-decompression limits, especially at depths where hammerheads are found, and managing current is key. The safety stop is usually conducted in shallower, more sheltered areas if available, or as a blue-water safety stop, with the liveaboard tender following the divers for pick-up. A dive computer and SMB are essential.

Underwater photography

Mount Serua is a prime location for wide-angle photography, especially during the hammerhead season. A fisheye or wide-angle lens (e.g., 8-15mm or 16-35mm) is recommended to capture schools of sharks and the dramatic seamount topography. Given the excellent visibility often exceeding 30 meters, ambient light can be sufficient in shallower areas, but strobes are crucial for bringing out the vibrant colors of the hard and soft corals on the walls, and for illuminating pelagics in deeper, less lit areas. Buoyancy control is paramount due to potentially strong currents, allowing you to position yourself effectively without damaging the pristine reef. For cetacean sightings, be prepared to quickly switch to video or capture fast-moving subjects.

Combine with nearby dive sites

• Nil Desperandum Atoll

  Another remote seamount known for schooling hammerheads in the Forgotten Islands

• Mount Nila

  A neighboring island in the Forgotten Islands chain, also offering pelagic encounters

• Manuk Ridge

  Often called 'Snake Island,' known for sea snakes and pelagic action

• Koon

  A wall dive site with abundant fish life in the Banda Sea

• Pulau Hatta

  Features sloping reefs and schools of fish, with potential for eagle rays and hammerheads

Getting there & logistics

Access to Mount Serua and the Forgotten Islands is exclusively via liveaboard, typically departing from Ambon. Divers usually fly into Pattimura Airport (AMQ) in Ambon, with connecting flights available from Jakarta (CGK) or Makassar (UPG). Liveaboard itineraries generally range from 7 to 10 nights, covering a wide area of the Banda Sea, including the Forgotten Islands. Trips are carefully scheduled to align with the 'hammerhead window' in October/November and April/May, when sea conditions are calmer. There are no specific permits or fees mentioned for Serua itself beyond standard liveaboard costs, which often include marine park fees for the broader region. The site is part of extended itineraries that explore multiple remote locations in the Banda Sea.

Safety & environment

Due to the extreme remoteness of Mount Serua and the entire Forgotten Islands region, emergency medical assistance and recompression chamber access are extremely limited. The nearest major medical facilities and recompression chambers would likely be in Ambon or Bali, requiring emergency evacuation by liveaboard or air, which can take many hours. Divers must carry comprehensive dive insurance that covers emergency medical treatment and air evacuation. Site-specific hazards include potentially strong, unpredictable currents and thermoclines. Advanced Open Water certification with significant current experience and a minimum of 50 logged dives are strongly recommended. Nitrox certification is also advisable for extended bottom times. Always dive with a reliable dive computer, an SMB, and follow your dive guide's instructions closely, especially during pelagic-focused dives where depths can vary.

Who it suits — and who it doesn't

FAQ

Mount Serua FAQ

Liveaboards diving Mount Serua

These liveaboards may visit Mount Serua on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Wellenreng

Indonesia

9 guests25 m

$427/day

Mari

Indonesia

14 guests32.2 m

$328/day

Pindito

Indonesia

16 guests37.79 m

$533/day

Mermaid II

Komodo, Indonesia

18 guests

$355/day

Gaia Love

Alor

20 guests

$554/day

Emperor Raja Laut

Raja Ampat, Indonesia

12 guests31 m

$413/day

Malaillo

Indonesia

14 guests45.57 m

$348/day

Damai II

Komodo, Indonesia

14 guests

$459/day

DUNE Aurora

Indonesia

18 guests

$344/day

Calico Jack

Indonesia

10 guests30 m

$398/day

Coralia

Indonesia

16 guests48 m

$577/day

Ilike

Indonesia

16 guests40 m

$298/day