Bill Acker

Bill-Acker_160PADI Open Water Instructor #34545. TDI Enriched Air Instructor #1919. SSI Platinum Pro 5000 Member.
Bill founded Yap Divers in July 1986 and has pioneered the dive industry in Yap ever since. Most of the dive sites of Yap were personally discovered and named by Bill and he is always looking for new and better diving for his guests. With over 12,000 logged dives, most of them here in Yap, you can be sure that you are diving with an experienced professional when you dive with Bill. He regularly dives with the guests and continues to enjoy discovering new sites and new critters.

Bill is proud of what he has built at Yap Divers. It is the best equipped, most experienced dive shop around and has an impeccable safety record.

Personal Promise: The Ocean is a very precious part of this world and we are very fortunate to have the technology to discover and enjoy the underwater wonders. My goal is to insure that every person diving with Yap Divers has a safe and unique dive experience with memories to last a lifetime. Do we succeed with every person – no? But my personal promise to you is that we will continue improving and trying until we do succeed with every guest, every day, every dive.

OP Acker

PADI Dive Instructor
Oliver Patrick ‘OP’ Acker

PADI Open Water Instructor #388185. Until recently, Op was a student and resident of Hilo, Hawaii before returning to Yap to work in the family business. Op has been a certified diver since the tender age of 11 and has since then logged 3,500 dives.

You can find him at the dive shop or in the pool teaching dive courses to new adventurers.


John-Pekailug_160John Pekailug

Born on Lamotrek Atoll in the State of Yap on the 31st of January, 1962. Graduated from Outer Island High School. Learned to dive with Yap Divers in August of 1993 as a dive shop summer hire. Has worked with Yap Divers since then and has logged more than 7,500 dives in and around Yap. Few, if any, people know Yap better than John. Not only an excellent diver but also very personable and a leader among the staff. Regularly mentioned as one of our top dive guides.

Favorite Dive. Any Manta Dive. I enjoy identifying the individual rays and watching their behavior. I also enjoy taking guests to see these magnificent creatures.



Alex Raimon

Born on Satawal in Yap State on the 17th of July, 1963. Graduated from Pohnpei Agricultural & Trade School (PATS) and learned to dive at Yap Divers in February of 1991 and has worked with us ever since. Our most experienced dive guide, Alex also speaks fluent Japanese as well as fluent English. He has upwards of 8,000 dives and has explored several of Yap’s most famous dive sites. Alex’s popularity is legendary as evidenced by the numerous cards and letters received from past guests.

Favorite Dives: Paaw Reef because of the beautiful hard coral formations and the abundance of fish. There are almost always sting rays, nurse sharks, turtles and the occasional dolphin and Yap Corner because when you first jump in the clear, deep blue water is visually overwhelming and the drift into the channel offers a school of baby sharks, large gray reef sharks, eagle rays, schools of barracuda and big eyed jacks.


Nico-Erhieisap_160Nicholas “Nico” Erhieisap

Born on Satawal Island on the 1st of May, 1965. Graduated from Outer Island High School on Ulithi Atoll in May 1984. Attended Palau Community College and studied business. Nico learned to dive with Yap Divers in 1996 and currently has over 7,000 dives around the island of Yap. Nico makes up 1/2 of the “A Team”, along with Bill Acker, for his uncanny ability to find the manta rays on every dive.

Favorite Dive: Yap Caverns because on every dive you can see everything from extra small to extra large. From leaf fish to whale sharks (yes I really have seen one there). The crystal clear water on the walls, the shark cleaning station, the occasional pod of dolphins just add flavor to the macro life found in the sandy parts of the Caverns.


Gordon-Keiji_160Gordon Keiji

Born in Yap on the 25th of November 1970 and graduated from Yap High School in 1988. Began working in the hospitality industry immediately after school. His first job was as a jack of all trades for the Alphonso Family, owners of the ESA Hotel. In June of 1997 Gordon moved to Beyond the Reef dive shop and was a dive guide for them until he had to leave work in early 2006 to take care of his parents. Tragically, Gordon’s mom passed away but his father has made vast improvements allowing Gordon to resume doing what he does best – scuba diving. Gordon came to Yap Divers on Halloween of 2006 and has quickly become one of our most dependable guides. He has over 3,000 dives in and around the reefs of Yap.

Favorite Dive: The Manta dives because those dives offer a combination of everything. Obviously, the guests are here for the mantas and to help our guests get up close and personal with these magnificent animals is a big thrill for me. I also like all of the other marine life in the channels with the rays.



Born on Satawal Island February 1st 1975 and graduated Yap Outer Island High School in 1993. Kintu has been guiding with us since 2006 with over 4000 dives. Previously he was a guide in Palau with Sea World Dive Center.

Favorite Dive: Stammtisch, because of the big Mantas cleaning



Born in Yap September, 1971 and graduated Yap High School in 1985. Mike started diving with us in 2009 and has over 3000 dives.

Favorite Dive: M’il Channel because of the size of the area and diversity of marine life.



Born in Woleai Atoll on January 9th, 1975 and graduated at Woleai Elementary School in 1989. Charles has been diving Yap since 2009 and has over 4000 dives.

Favorite Dive: Gilman Wall for the clear water, amount of fish, sharks and the dramatic vertical wall.



William_160William “Small Willy” Seiwemai

Born on Woleai Atoll in Yap State on the 14th of February, 1957. Graduated from Outer Island High School and began his working career as seaman on the M/V Micro Spirit (the ship that goes between Yap and the Outer Islands) in the early 70’s. William worked his way up to the position of 2nd officer before he resigned and took a job as Captain of the M/V Fasiral. Small Willy came to Yap Divers in January of ’98 and has been with us since then.

Stronger than an ox but gentle as a lamb, William is a favorite of our guests and is always ready to offer a helping hand with any need.

Quote: Being the captain of a boat like Popou is a challenge that I enjoy. With brand new engines, equipment and instrumentation, it is a big responsibility to take care of her and I enjoy that responsibility.



Born, in Ifalik Atoll on February 24th, 1965 and graduated at Outer Island High School in 1985. Start working with Yap Divers in 2008. Matt prides himself on the quality of his work diligently managing our diving gasses, cylinders and equipment.

Favorite Quote: “The best of the best”

Availability & Reservations

Chris Mars
Chris Mars
18:28 26 Mar 19
This is my home island.. Iam just giving it 5 star review cuz i miss home.. Feels like forever since I Last visitedread more
stacey blake
stacey blake
16:26 20 Mar 19
Beautiful resort and location, small and quaint with very attentive service from wonderful staff who were extremely friendly and helpful, and knew everyone's name (travelled with a group of 20 people) within the first day. Yap Divers staff were amazing, we were even offered hot tea during our surface intervals with some delicious snacks, and they ensured we had the best possible dive experience on each dive. I would return to this gorgeous island and absolutely stay at Manta Bay Resort again, it's well worth the trip!read more
Shaun Suliol
Shaun Suliol
11:48 12 Mar 19
The staff made sure our every needs were met! They were accommodating to my groups weird requests. We felt spoiled. They even remember our names. No where else but in Yap at the Manta Ray!read more
Doreen Korbl
Doreen Korbl
19:09 10 Mar 19
incredible service, special thanks to Ruud the resort manager
Michael Fusco
Michael Fusco
04:49 22 Jan 19
MantaRayBay Resort, is THE dive resort. It is so obvious that this place was designed for divers, BY divers. The concept that all of the guests are part of the resort family seems to be the cornerstone of MRB Resort. The dive service is top notch; the wait staff spot-on, the resort staff super friendly and attentive. The dive sites are great, especially the southern walls, and of course the cleaning stations visited so often by the Manta Rays. I have gone scuba diving all over western Asia and the Caribbean, and MRB Resort is at the top!read more
Deb Roy-Stothart
Deb Roy-Stothart
13:55 06 Dec 18
The highest level of dive service ever experienced! Fabulous dive operation from crew, boats, snacks, hot tea and water, warm towels etc. etc. and of course the Manta Rays!! Thank you for making my 100th dive so memorable. Accommodations 5 star! Food was fabulous! Can't say enough about this beautiful Island and it's people. Loved Yap! Deb & Glenn, London, Ontarioread more
Jan Toman
Jan Toman
22:14 02 Nov 18
Great! GREAT! GREAT! Lovely place, lovely staff, great location for divers!
Ms. Malinda
Ms. Malinda
13:52 14 Oct 18
Great place to stay while visiting the island. Lots of activities to do with places to see & people to meet.read more
Rene Sten
Rene Sten
04:06 12 Oct 18
Bill and his family run a great dive resort, rooms are spacious and comfortable. Restaurant and bar provide good range of food and drink. Bill and his dive guides know the reef intimately and the diving is spectacular. Bill and his family make for a very friendly and rewarding experience in Yap.read more
Jonathan Gapith
Jonathan Gapith
10:31 19 Sep 18
Best dive resort around, amazingly friendly staff and great food on the mnuw
Daniel Granzer
Daniel Granzer
11:40 23 Aug 18
We were from 11.08 to 18.08 at the Manta Ray Bay resort and had unforgettable days there 😍In total we made 12 dives with wonderful encounters. Highlights were, of course, the manta rays in the Goofnuw Channel and many white tip reef sharks in the Shark City 🦈 But also we saw eagle rays, turtles 🐢 and buffalo head parrotfish. The hotel is beautiful and the whole team does a great job there. The food on the ship Mnuw, as well as the home-brewed beer are excellent. Thank you again to the whole team of Manta Ray Bay Resort and Yap Divers 👏🏼We also did a one-day land tour to explore the many beautiful places of this unique island. The beach is like in paradise🏝, stone money and relics from the second world war very worth to see! You find there also culturally typical houses with different meaning and use! It would be nice if more visitors would come to this great island and appreciate the great work that is done there! Anyway, we really enjoyed it and would come back anytime 🙏🏻✌🏼read more
Emily Caquelin
Emily Caquelin
04:10 02 Aug 18
Manta Ray Bay Resort is a great dive resort with extremely hospitable staff.
William Myers
William Myers
21:01 21 Jul 18
Great hotel. Have stayed twice.
Jim Reilly
Jim Reilly
11:27 21 Mar 18
We stayed at the hotel and dove with Manta Ray divers in early December 2017. The hotel is very comfortable, well run and staffed with wonderful employees. During our visit my wife came down with an illness and the consideration and support from the hotel and dive staff could not have been better.read more
Sandy Stinson
Sandy Stinson
16:03 03 Mar 18
The staff couldn't be more friendly and accommodating. Food is good, (worth upgrading to include all meals). Diving is good too.read more
Alex Divinsky
Alex Divinsky
17:24 01 Jan 18
The best place to stay in Yap. The resort is really nice and clean, the scuba diving is great, and the docked ship that houses the bar, restaurant, and movie screen is very cool. I really enjoyed my stay here.read more
10:44 01 Jan 18
Offers one of the best accommodation service. It also has a uniquely designed restaurant.
Yi-Hsin Lin
Yi-Hsin Lin
00:53 21 Feb 17
The whole place centers around the scuba diving operation. Probably better to find somewhere else if you're not a diver. The dive operation was generally good, but a little too laid back - schedules weren't always clear, and sometimes would change without any notice. Sometimes it was hard to tell if this was really because of changing tides/weather or because of the island pace of life. Pizza is a surprisingly good option at the restaurant.read more
Next Reviews Write a review