Experience Spawning and Blackwater in Micronesia

Palau Diving

May 15 to 26, 2024
Cost: $9,380
Leader: Scott Davis +2
Group Size: 16
Days: 12

Safari Overview

Snorkel, paddle, sail, and dive among awe-inspiring tropical islands in the western Pacific Ocean on our scientific exploration of the Palau National Marine Reserve. Seek hidden pockets of pristine beauty around West Ngeruktabel Island and Risong Bay before the Palau Siren beckons you to join her in an exploration of Palau’s most mythical dive sites. With multiple daily dives from dawn through nightfall, you will join the early morning world of snapper spawning rituals as well as the nighttime abyss illuminated by hanging lights on blackwater dives. In between, explore and photograph blue holes, drop-offs, caverns, caves, and channels. Science and art are truly one on this journey.


  • Discover seahorses and a myriad of other dazzling fish after snorkeling through a coral-filled tunnel.
  • Experience the offshore on the Palau Siren.
  • Dive at sunrise to view the rhythmic dance of thousands of snappers.
  • Behold 100 million tons of biomass rise to feed at night.

Itinerary Updated: October 2022

Wildlife Safari Coordinator: Patti Collins

Ship Info Print Trip
Date Description Lodge Meals
May 15–16 Travel to Koror, Palau.
May 17 Arrive in Koror. Palau Pacific Resort, Koror
May 18 West Ngeruktabel snorkeling odyssey. Palau Pacific Resort, Koror B, L, D
May 19 Kayak Risong Bay in the morning, then embark on the ship for your diving adventure. On board the Palau Siren B, L, D
May 20–25 Experience spawning and blackwater dives. Dive many iconic Palau sites and snorkel the infamous Jellyfish Lake. On board the Palau Siren B, L, D
May 26 Fly Home. On board the Palau Siren B

Our Trip Leaders

Scott Davis

Scott, co-owner and co-CEO of Cheesemans’ Ecology Safaris, is an expert wildlife, nature, and travel photographer. Trained as a wildlife and marine biologist, he's explored all seven continents for research and photography. National Geographic, BBCAnimal PlanetNY Times, and other prestigious publications have featured his inspiring work. Scott's passion for teaching and talent for capturing the essence of his subjects make him a highly sought-after tour leader.

Richard Barnden

Richard has been guiding and photographing marine life in the Pacific Ocean for nearly 20 years. His passion is in unique underwater imagery, specializing in spawning aggregations and blackwater night diving. Richard moved to Palau in his early twenties as a video pro then cruise director of multiple liveaboards where he continued filming. He has spent the last ten years researching spawning aggregations and their predictabilities. Richard’s specialty is leading spawning expeditions timed around lunar phases to observe fish reproduction.

Macstyl Sasao

Macs grew up in Palau and the Pacific Northwest of the US. His relatives taught him the advanced arts of Micronesian hunting and fishing. He quickly adapted to a lifestyle that revolves around the moon and the tides, which  requires an intimate knowledge of fish behavior and the ability to free dive under the full moon to find masses of spawning fish. As ecotourism developed in Palau, finding that his knowledge translated well into photography, Macs traded his spear gun for an underwater camera. He now shares his passion for Palau's environment as a guide and photographer.

Detailed Itinerary

A glimpse into our journey

Travel to Koror, Palau

May 15–16

Arrive in Koror

May 17

Our local agent will transfer you from the airport to the hotel. If you would like to arrive earlier, we can arrange divergent airport transfers and extra nights.

Snorkeling odyssey

May 18

Saltwater Crocodile
© Ocean Productions

Snorkel through a coral-filled tunnel into a turquoise oasis known as Lost Lake. Swim with sea horses and shrimp fish in charming Sea Horse Bay. Seek out sub-adult crocodiles within the labyrinth of islands adorning West Ngeruktabel.

Kayak Risong Bay and embark on the ship

May 19

Bull Shark and Red Snapper
© Richard Barden

Snorkel the crystal-clear waters of Mandarin Fish Lake in search of exquisite fish and coral. Plant clams within a secreted sanctuary as a part of our “Adopt a Clam” project. Paddle into Black Tip Lake in search of baby sharks and rays.

Embark on your ship around 6:00pm, which will be your home for the next seven nights.

Spawning, nightwater diving, and Palau’s best

May 20–25

© Richard Barden

On the first morning, you’ll participate in a check out dive. Timed to experience the rich waters of Palau, you will spend the rest of time on board diving three to four dives per day! In addition to the spawning aggregations and blackwater diving, you will dive Palau’s best dive sites, most are world-class, with underwater features like blue holes, drop-offs, caverns, caves, and channels. Visibility is often seemingly endless and can go up to 100ft (30m) on good days, which is perfect for widen angle photography. You can dive in Palau year-round, but the best diving is generally between October and July.

Red snapper (Lutjanus bohar) spawning only takes place during a full moon cycle and has been predicted and documented for the last ten years. Dive at sunrise to witness the spectacle of thousands of snappers swim back and forth in a ritual-like dance before swimming off to spawn. This dance may last for an hour with bull and blacktip reef sharks in hot pursuit. You will have the opportunity to dive two sites to witness snappers propagating.

Blackwater night diving started commercially in Hawaii more than 15 years ago. Typically, you dive in the middle of the ocean into the nighttime abyss. By hanging lights at around 15m for a stable reference depth and drifting over a contour of a 1,000m, or as deep as you can, microscopic zooplankton rise from the depths bringing with them an array of magical creatures. Discover the biggest migration of animals on Earth that happens every night; about 100 million tons of biomass rise from the mesopelagic layers (so deep that light cannot penetrate) to the epipelagic layers (close to the surface) to feed and respire on richer oxygen concentrations. You will have the opportunity to try several open-ocean blackwater and bonfire (closer to the reef) night dives during your expedition.

While diving Palau’s known sites you will also have the chance to encounter manta rays at reliable locations.

Fly home

May 26

Disembark around 10am after breakfast and fly home.


Sail tropical islands in the western Pacific Ocean on our scientific exploration of the Palau National Marine Reserve.

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Ship Information

Palau Siren

The 40-m Palau Siren was designed by divers for divers to provide superior ease and comfort. Scuba enthusiasts will explore pristine, remote dive sites while overnighting in lavish accommodations. The crew of 12 is on hand to ensure you have the best trip possible. This intimate liveaboard offers ample space including eight large cabins equipped with individual climate controls, entertainment systems, and en suite bathrooms.

More Information

Cost & Payments

Costs (in US$)

Type Description Cost Per Person
Premium Double occupancy, one double-sized bed, entertainment system, and portholes. Cabins 1 and 2. $9,380
Premium Double occupancy, two twin-sized beds, entertainment system, and portholes. Cabins 3–8. $9,380

Costs are per person, double occupancy, not including airfare, singles extra. See Included and Not Included sections for more details.

If you are a single traveler, we will find a roommate for you, but if we cannot find you a roommate, we will not charge you a single supplement. If space is available, some cabins can be booked as a single by adding 100% over the listed cabin cost.

We cannot guarantee a specific cabin number, but if changes occur, we will assign a cabin of equal or greater value.

Payment Schedule

Payment Due Date Amount Per Person
Deposit Due now to reserve your space $1,500
Final December 7, 2023 Remaining Balance

Payments are due based on the schedule above. All reservations require a deposit to confirm reservation of your space.


Refunds are given depending on the time left before departure according to the following table. Through October 6, 2023, the cancellation fee of $300 per person can be applied toward another trip if reserved within six months of the cancelled trip’s departure date. Cancellations are non-transferrable.

Dates Forfeited Amount per Person
On or before October 6, 2023 $300 (see terms above)
October 7 to November 6, 2023 10% of trip cost
November 7 to December 6, 2023 40% of trip cost
On or after December 7, 2023 100% of trip cost


  • All leaders and transport for all activities unless described as optional.
  • Permits for Peleliu, Rock Islands, and Jellyfish Lake.
  • Accommodations for the nights of May 17 through May 25.
  • Seven nights on board the Palau Siren.
  • Cabin taxes on board the Palau Siren.
  • Meals from breakfast on May 16 through breakfast on May 26.
  • Transfers on May 17 between the Koror Airport and Palau Pacific Resort, on May 19 to the Palau Siren, and on May 26 from the Palau Siren to the Koror Airport.
  • Soft drinks, juice, tea, and coffee while onboard the Palau Siren.
  • Lectures on board the Palau Siren.
  • Trip Materials – information about flights, packing, entry and departure requirements, airport transfers, gratuities, etc.
  • Tanks, weights, BCD, regulator, 3mm wetsuit, mask, and fins.

Not Included

  • All airfare, airport and departure taxes, and excess baggage fees. Round-trip airfare is approximately $1,700 to $2,000 between the US and Koror, Palau, depending on origin.
  • Passport and visa fees.
  • COVID tests.
  • Divergent airport transfers and extra hotel nights (arranged by us).
  • Gratuities – tipping is always discretionary. However, we suggest budgeting about $440 for ship crew for the ship portion of the trip.
  • Nitrox.
  • Mandatory dive insurance. For more information see travel insurance.
  • Optional trip cancellation insurance. For more information see travel insurance.
  • Items of a personal nature such as laundry, telephone calls, medical costs or hospitalization, room service, alcoholic beverages, items not on the regular menu, etc. If you have special dietary needs, please indicate them on your Reservation Form.


In May, average temperatures range from the mid- to upper-70s°F (24 to 26°C) at night up to the mid- to upper-80s°F (29 to 32°C) during the day, with high humidity and about a 50% chance of rain showers. The water temperature averages 84°F (29°C).

Fitness Level

With the strong currents of the Pacific Ocean sweeping through Palau, most of the dive sites require divers with experience. Please contact us if you have any concerns that may make this trip challenging.


Airfare is not included in trip costs. Detailed logistical information and the contact information for our recommended flight ticketing agent are included in the Trip Materials we will send you. Please let us know if you are arriving earlier or staying later, as we are happy to assist you with any extra overnights that you might want to arrange.

Flights you (or a travel agent) book: Arrive in Koror, Palau (ROR) by 11:59pm on May 17. Depart from Koror, Palau (ROR) after 1:00pm on May 26. If you are continuing on our Palau Snorkeling trip, see the Flights section in its itinerary for departure information.



Motion Sickness

Don’t let a fear of seasickness scare you away! It’s a good idea to bring medication if you get seasick or are unsure, but you may find that you do not need it after a couple days once you have your “sea legs.” Even those who have experienced seasickness reported that the incredible wildlife and overall experience were well worth the temporary discomfort. Read our suggestions for coping with seasickness at and contact us if you have any concerns.



Our company ethos has always regarded conservation as inseparable from responsible tourism. We struggle with the dilemma that traveling worldwide expends climate-changing carbon. However, we wholeheartedly believe that traveling with us will cultivate your passion for conserving our beautiful world while stimulating each destination’s local economy. We encourage you to explore the various ways in which Cheesemans’ operates within this context:


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