Join Unique Ocean Expeditions for one of nature’s most electrifying underwater events — the New Moon Bumphead Parrotfish (Bolbometopon muricatum) Spawning event.

This rare spectacle happens every month, when up to a thousand bumphead parrotfish gather in mass to spawn, attracting an incredible cast of ocean predators.

Set in the pristine waters of Palau, this expedition offers front-row seats to one of the Pacific’s greatest underwater shows. You’ll dive alongside world-class guides who know exactly where and when to be in the action, ensuring you witness this extraordinary aggregation at its peak.

In addition to the spawning event, the expedition includes Palau’s legendary drift dives, shark-filled channels, vibrant reefs, and the chance to encounter manta rays, turtles, and schooling barracuda. And because the magic happens under the new moon of night, expect spectacular night dives and blackwater/bonfire dives.

This is not just a dive trip — it’s a bucket-list marine wildlife encounter for serious divers, photographers, and ocean lovers.

Spaces are limited due to the seasonal nature of the phenomenon, so secure your spot and experience the heartbeat of the ocean moonlight.

Camouflage Grouper Spawning – Palau

In the days leading up to the new moon, something extraordinary begins to unfold in the channels of Palau. From across the reefs, tens of thousands of camouflage groupers (Epinephelus polyphekadion) converge on a handful of precise locations—drawn by an ancient rhythm tied to the lunar cycle.

This is not just a gathering. It’s one of the most powerful marine events on the planet.

Our expedition builds toward this moment. We start by diving Palau’s legendary current-swept sites, dialing in buoyancy, positioning, and awareness—because what’s coming next demands it. As the light fades and the ocean shifts, we enter the water at dusk.

Then it begins.

Out of the blue, the aggregation forms—layer upon layer of groupers filling the water column. The reef comes alive with movement, tension, and anticipation. And then, in a sudden, synchronized explosion, the fish surge upward to spawn—releasing clouds of life into the current in a chaotic, breathtaking display.

It’s raw. It’s intense. It’s unforgettable.

But the story doesn’t end there.

This explosion of activity draws in the apex predators of Palau. Bull sharks, oceanic blacktips, lemon sharks, and grey reef sharks move in—circling the edges, cutting through the chaos, turning the event into a full-scale feeding spectacle.

This is nature at its most honest. No filters. No staging. Just the ocean doing what it has done for thousands of years.

Very few divers ever witness this.

You will.

Leading up to the new moon hundreds of Bumphead Parrotfish (Bolbometepon muricatum) are gathering around Palau’s outer reefs and channels preparing to spawn.

We begin our expedition before the new moon diving some of the big name sites with currents in preparation for the main event.

These dives are early morning starts, as the sun rises, we will begin the dive to watch as the spectacle unfolds. A huge aggregation of Bumphead parrotfish will spill from the lagoon into the dive site like a waterfall, to ensure the continuation of their species.

Witnessing this natural behavior--which only can be described as some kind of majestic dance is a must see.

Blackwater Night Diving – Into the Unknown

Long after the sun has disappeared and the reef has gone quiet, we head out into the open ocean—far from land, with nothing beneath us but thousands of feet of water.

No reef. No bottom. No reference.

Just darkness.

Suspended in the blue, we descend alongside a downline illuminated by powerful lights. And then, slowly, the ocean begins to reveal its secrets.

This is blackwater diving.

Every night, the largest migration on Earth rises from the depths—millions of larval and deep-sea creatures making their journey toward the surface under the cover of darkness. Creatures that spend their entire lives hidden in the abyss suddenly appear, drifting just inches from your mask.

Alien-like squid. Transparent fish. Bioluminescent jellies. Perfectly formed juvenile species that look nothing like their adult counterparts.

This is a world very few people have ever seen.

There is no chasing here. No searching. The ocean comes to you. Each moment is unpredictable—one second empty, the next filled with something so strange and beautiful it barely feels real.

It’s quiet. It’s surreal. And at times, it’s completely mind-bending.

Blackwater diving isn’t just another dive—it’s a journey into a hidden dimension of the ocean. A place where evolution runs wild, and every encounter feels like discovering something new for the very first time.

Once you’ve done it… nothing else quite compares.

Palau is a diver’s paradise, where crystal-clear waters meet some of the richest marine biodiversity on the planet.

Known for its thrilling drift dives, shark-filled channels, vibrant coral reefs, and legendary sites like Blue Corner, Palau offers a perfect blend of big animal encounters and kaleidoscopic reef life. From manta rays and turtles to massive schools of barracuda, every dive here delivers world-class underwater adventure.

Palau is one of those rare dive destinations where the ocean delivers year-round — but knowing what to expect from the weather and water conditions can help you plan the perfect trip.

Water Temperatures
Palau’s waters stay warm and inviting all year, ranging from 27–29°C (81–84°F). A 3mm wetsuit is enough for most divers, though photographers or those prone to feeling chilly may prefer a 5mm for longer dives.

Visibility
The average visibility is excellent, typically 20–30 meters (65–100 feet), but can be crystal-clear in the dry season. During spawning aggregations or after heavy rains, the water may carry more plankton — but that also means more marine life and incredible big-animal action.

Currents
Palau is famous for its drift dives. Sites like Blue Corner and Ulong Channel thrive on strong currents that bring in sharks, jacks, and barracuda. Your guides will time dives for peak action, but comfort in current is a must.

Weather Seasons

• Dry Season (November – May): Generally calmer seas, sunnier skies, and top visibility. Peak season for tourism.

• Wet Season (June – October): More chance of rain and occasional swell, but still warm, with lush green islands and fewer crowds. The rain often comes in short, heavy bursts, leaving plenty of sunshine between.

Bottom Line
Whether you come in the dry or wet season, Palau delivers spectacular diving — from shark-filled channels to manta cleaning stations and rare spawning events. The key is choosing the right time for the experience you’re after, and that’s where Unique Ocean Expeditions makes sure you’re in the water when nature puts on its best show.

Our Full Moon Red Snapper and Spawning Expeditions are designed for experienced divers who are comfortable in strong currents and changing conditions.

To join these trips, you must be at least an Advanced Open Water Diver (or equivalent) with a minimum of 50 logged dives.

Many of the sites involve drift diving, negative entries, and time spent at depth. You should be confident with your buoyancy, able to manage your gear independently, and comfortable using a reef hook in current.

For photographers, please ensure you have experience handling your camera setup in similar conditions, as these dives can be action-packed and fast-paced.

If you’re unsure whether your experience is suitable, contact us — we’re happy to help assess your readiness or recommend a refresher or upgrade before your trip.

To join your Unique Ocean Expeditions Full Moon Red Snapper Spawning Trip aboard the Palau Siren, you’ll need to book your international flight to Roman Tmetuchl International Airport (ROR), located on the island of Koror, Palau.

Palau is served by several airlines, with common routes coming from Guam (GUM), Manila (MNL), Taipei (TPE), Seoul (ICN), and Tokyo (NRT). Many itineraries connect via Guam or Manila.

We highly recommend arriving in Palau at least 24–48 hours before embarkation day to allow for any delayed flights, missed connections, or delayed baggage — especially important if you’re traveling with dive gear and camera equipment.

For early morning departures, plan to arrive in your gateway city (e.g., Guam or Manila) the day before, as flights into Palau often operate late at night.

Visa & Entry Requirements

Most nationalities receive a free 30-day tourist visa on arrival in Palau, which can be extended to 90 days. U.S. citizens may stay visa-free for up to one year.

Your passport must be valid for at least 6 months beyond your departure date, and you must have proof of onward travel.

Palau has an environmental protection fee (sometimes included in your airfare) and a Pristine Paradise Environmental Fee (PPEF) of USD $100, which covers both the Green Fee and Departure Tax. Airlines often collect this at the time of booking, but verify with your carrier to avoid surprises at the airport.

Arrival in Palau

Flights into Palau often arrive late at night. Upon landing, you’ll clear immigration and customs at ROR Airport. Our crew or a representative from Palau Siren will meet you outside the arrivals hall and assist with your transfer to the vessel or your pre-arranged hotel.

If arriving more than a day early, Koror offers a range of accommodations from simple guesthouses to luxury resorts — all within a short drive from the airport and docks.

Pre-Trip Recommendations

• Arrive early: Gives you time to recover from long-haul flights, adjust to the time zone, and sort any baggage issues before boarding.

• Check baggage allowances: Especially if transiting through smaller regional flights.

• Bring cash: While USD is the official currency, not all shops or restaurants take cards.

Payment Schedule

Booking deposit (non-refundable)                            5% 

Payment 2 - 12 months prior to departure               30% 

Balance payment - 6 months prior to departure   65%

Terms & Conditions

All bookings are subject to the provisions in our "Terms and Conditions" and "Payment and Cancellation Terms" found on our website:
Terms & Conditions
Payment & Cancellation Terms

When it comes to dive travel, anyone can take you somewhere beautiful — but we take you somewhere unforgettable.

At Unique Ocean Expeditions, we don’t just sell trips; we create front-row seats to nature’s greatest marine spectacles. From the explosive energy of Palau’s Full Moon Red Snapper Spawning to shark-filled channels, manta encounters, and pristine reefs, our expeditions put you in the right place, at the right time — every time.

Here’s why seasoned divers choose us:

• Unmatched Expertise – Led by expert guides and award-winning underwater photographers.

• Exclusive Encounters – We specialize in timing trips with rare natural events you can’t just stumble upon — spawning aggregations, predator hunts, and big-animal action.

• Small Groups, Big Experiences – We keep numbers low so you get maximum time in the water, personal guidance, and the freedom to enjoy the moment without the crowds.

• World-Class Partnerships – We team up with the best liveaboards and dive operators in the Pacific to give you luxury, safety, and adventure in one seamless package.

• Ocean First – We’re committed to sustainable practices and marine conservation, ensuring these incredible experiences remain for generations to come.