Dive Site: Gilman Wall

About Gilman Wall

Gilman Wall is one of Yap's premier dive sites, renowned for its spectacular vertical drop-offs and consistent pelagic action. Located on the outer reef, this site plunges dramatically from a shallow reef top into the deep, creating a diverse ecosystem that attracts a wide array of marine life. Divers can expect to explore vibrant hard and soft coral gardens, teeming with reef fish, before venturing into the blue to encounter larger species. The topography is characterized by a sheer wall that begins close to the surface, descending well beyond recreational diving limits. This structure, combined with strong currents, makes it a dynamic environment where divers often find themselves in close proximity to schooling fish and transient pelagics. The shallower sections of the wall are adorned with colorful sponges and anemones, providing shelter for macro life, while the deeper parts are patrolled by sharks and other large predators. Marine life at Gilman Wall is prolific year-round, with regular sightings of sharks, barracudas, and various reef fish. The currents often bring nutrient-rich waters, attracting manta rays, especially during specific tidal conditions, although Yap is famous for manta sightings across many sites. Visibility typically ranges from good to excellent, enhancing the experience of drifting along this impressive underwater landscape. Access to Gilman Wall usually involves a short boat ride from local dive centers, with dive operators often scheduling dives around tidal charts to optimize conditions. Due to the potential for strong currents and its depth, it is best suited for experienced divers comfortable with drift diving techniques. The site offers a truly immersive Micronesian diving adventure, showcasing the raw beauty and biodiversity of the region's reefs.

Dive site facts: Gilman Wall

Depth

5–40+ m

Typical dive

15–30 m, 45–60 min

Current

Strong, drift dependent

Visibility

20–40 m

Water temperature

27–29 °C

Entry

Live boat / tender drop

Level

Advanced Open Water Diver with current experience

Dive type

Wall, drift, pelagic

Region / port

Yap, Micronesia

Coordinates

9.52, 138.07

Conditions & Currents

Gilman Wall is known for its strong currents, which can vary significantly with tides and lunar phases. Divers should anticipate drift diving as the primary mode of exploration, often being dropped up-current and picked up down-current. Surge can be present, particularly near the surface and along the wall face, requiring good buoyancy control. Visibility is generally excellent, often exceeding 30 meters, but it can be affected by plankton blooms that currents bring in. These currents, while challenging, are also responsible for attracting the abundant pelagic life found at the site. Divers must be proficient in advanced drift diving techniques and be comfortable in exposed conditions. Dive operators typically plan dives to coincide with optimal tidal conditions to maximize safety and enjoyment, but unprepared divers may find the currents demanding.

Marine life & sighting chances

Manta Ray

Year-round · occasional

White-tip reef shark

Year-round · common

Grey reef shark

Year-round · common

Hawksbill turtle

Year-round · occasional

Barracuda

Year-round · common

Spotted eagle ray

Year-round · occasional

Large schooling jacks

Year-round · common

Tuna

Year-round · occasional

Anthias

Year-round · common

Anemonefish

Year-round · common

Dive profile & how the dive runs

Diving Gilman Wall typically begins with a negative entry from the boat directly onto the reef top or along the wall, depending on current conditions. The dive is usually a drift along the impressive vertical wall, allowing divers to observe the diverse marine life and intricate coral formations. You will descend to a maximum depth of around 30 meters, cruising past overhangs and small crevices. The current dictates the pace, carrying you effortlessly along the reef. The turn point is often determined by air consumption or dive time, with ascent planned gradually along the wall's shallower sections. The safety stop is conducted in the blue or near a protected part of the reef, depending on prevailing currents, before surfacing where the dive boat will meet you.

Underwater photography

Gilman Wall is a prime location for wide-angle photography, capturing the dramatic wall topography, schooling fish, and pelagic encounters. A wide-angle lens is essential for showcasing the vastness of the wall and large marine life like sharks and manta rays. For smaller subjects like reef fish and macro life on the coral ledges, a macro lens can be rewarding, but be mindful of strong currents making steady shots challenging. Strobes are highly recommended to bring out the vibrant colors of the corals and fish against the deep blue. Maintain excellent buoyancy control to avoid damaging the delicate corals, especially in stronger currents. Be patient and watch for moments when pelagics approach the wall, using the current to your advantage for positioning.

Combine with nearby dive sites

• Manta Ridge

  Renowned for frequent manta ray sightings at cleaning stations.

• Manta Valley

  Another excellent site for observing manta rays, especially during specific tidal flows.

• Yap Caverns

  Features unique swim-throughs and cave formations with interesting light play.

• Cherry Blossom

  A vibrant reef dive with diverse hard and soft corals and abundant reef fish.

• Shark Island

  Known for consistent shark encounters, particularly grey and white-tip reef sharks.

Getting there & logistics

To reach Gilman Wall and other dive sites in Yap, international flights typically connect through Guam or Manila to Yap International Airport (YAP). Once on Yap, local dive resorts like Manta Ray Bay Resort provide transfers and operate their own dive centers. Dive packages usually range from 7 to 10 nights, often combining daily boat dives with cultural tours. There are no specific marine park fees for Yap, but diving permits are usually included in resort packages. Given Yap's remote location, combining a trip here with other Micronesian destinations like Palau or Truk Lagoon for a multi-destination dive adventure is common, requiring inter-island flights.

Safety & environment

Yap has limited medical facilities, and the nearest recompression chamber is located in Guam, emphasizing the critical importance of proper dive planning and adherence to dive limits. Divers must have comprehensive travel and dive insurance that covers emergency medical evacuation. Given the potential for strong currents at Gilman Wall, divers should be experienced in drift diving and maintain excellent buoyancy control. Always follow your dive guide's instructions and stay with your group. Dehydration can be a concern in tropical climates; ensure adequate fluid intake before and after dives.

Who it suits — and who it doesn't

FAQ

Gilman Wall FAQ

Liveaboards diving Gilman Wall

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

Palau Siren

Micronesia

16 guests

$501/day

Solitude Gaia

Micronesia

18 guests40 m

$310/day

Palau Aggressor II

Micronesia

18 guests32 m

$292/day

Black Pearl

Micronesia

24 guests

$390/day

Ocean Hunter 3

Micronesia

16 guests29 m

$350/day

Pacific Master

Solomon Islands

20 guests30 m

$268/day