The Phinisi, Thailand


The Phinisi, officially known as ‘Cheng I Sao’, is the sister boat to The Junk and offers fantastic dive itineraries all year round in Thailand and Myanmar. Several different itineraries are on offer, varying from 4 to 10 nights in length. The 37m Phinisi was custom built by divers for divers, and the facilities reflect that. There is a large shaded dive deck, personal set-up, and storage area, as well as nitrox and quality dive equipment available to rent. An SMB is also offered for use during the trip free of charge. Various itineraries are available in Thailand to explore the clear blue waters of the Similan Islands and Southern Phuket. Dive sites visited include Koh Bon, Koh Tachai, and Richelieu Rock and in Southern Thailand: Koh Phi Phi, King Cruiser, plus 2 of the top dive sites in Thailand: Hin Muang and Hin Daeng. The Phinisi also visits the spectacular Mergui Archipelago in Myanmar between December and April. Famous dive sites include Black Rock, High Rock, Tower Rock, and Torres Island.

The Phinisi liveaboard caters to 18 guests in a choice of cabins to suit different budgets. Each cabin features individually controlled AC, ensuite bathrooms with hot water, bath towels, and ample storage space. Social areas include a sundeck with loungers, indoor and outdoor dining, 42" flat-screen TV, and a library of books, movies, and games. All meals are served buffet-style, all non-alcoholic/soft drinks are included. A selection of beers and wine is available at an additional charge.

The experienced captain, crew, and dive guides of The Phinisi will go that extra mile to make it a memorable trip for you. Call us or book online today to reserve your space.

FLEXIBLE BOOKING TERMS - Learn more about what this means

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Included: VAT, Airport Transfer, Drinking Water, Soft drinks, Tea & Coffee, Full-Board Meal Plan (All meals), Snacks, Diving Package, Land Excursions, Cabin Towels, Deck Towels.

Required Extras: National Park Fees (50-350 USD per trip), Port Fees (50-350 USD per trip).

Optional Extras: Gratuities, Local Flights, Alcoholic Beverages (2.50-3.75 USD), Nitrox (25 USD per day), Nitrox Course (100 USD), Rental Gear (25 USD per day), Scuba Diving Courses (200-250 USD), Snorkel Gear.

Book now, pay later: You can easily place your booking online. We will then hold the spaces for you and you can confirm with a payment later.

* Extra fees are shown per person.

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Boat features

  • Camera Station
  • Audio & video entertainment
  • Library
  • Air Conditioned saloon
  • Aircon Cabins
  • Sun Deck
  • Indoor Saloon
  • Non-Diver (Snorkeler) Friendly
  • Warm Water Showers
  • Outdoor Dining
  • Charging stations
  • En-Suite bathrooms
  • Non-Smoking Rooms
  • Separate Rinse for u/w Camera
  • Leisure Deck

Food & Drinks

  • Western Food
  • Local Food
  • Buffet style
  • Beer available
  • Full-board Option
  • Al Fresco Dining

If you have any specific dietary requirements whilst on-board your cruise, you can add this to your special requests on step 2 of the booking form. We advise limiting these requests to religious beliefs or food allergies.


  • DIN Adaptors
  • Nitrox available
  • Rebreather Support
  • Rinse Hoses
  • Dive deck
  • Tenders for diving

The crew speaks English.

Gear Rental

There is diving gear available on this boat. Please provide your rental needs on the booking form. See below for further details on inclusions and pricing. Show prices.

Drawings & Vessel Layouts

#deckplan floorplan

Boat Specifications

  • Year built 2007
  • Length 34 m
  • Cruising speed 8 knots
  • Engines 1x 380 hP
  • Max guests 18
  • Number of cabins 7
  • Number of bathrooms 7
  • Tenders 2

Boat Navigation and Safety

  • Depth Sounder
  • Radio VHF/DSC/SSB
  • E.P.I.R.B. Distress System
  • Emergency Rafts
  • Life Vests
  • Oxygen
  • First Aid Kits
  • Satellite & mobile phones

The Phinisi Reviews

  • 9.0 Superb
  • 41 Verified Reviews
  1. Vessel
  2. Crew
  3. Food
  4. Diving
  5. Value
  • 10 Exceptional
  • Amber G
  • United States United States
The liveaboard of a lifetime.

This boat and its staff brought together a fantastic group of human beings with whom to spend a week diving. The accommodations and the gear were all top notch. During my time on board, I completed my advanced certification with Jonathan, who is an incredible mentor and cruise director. Also important, the staff and crew on The Phinisi are incredibly respectful of marine life and observant of the national park regulations. Highly recommend.

Recommended for
Staff, food, diving
  • 10 Exceptional
  • Grant G
  • United States United States
Best decision ever!

Amazing warm water and dives, 3-4 dives/day was amazing, diving on lockdown (totally organized, very little wait time to get in the water) :)

Recommended for
Friendly and knowledgeable crew/dive masters, food, atmosphere on the dives/boat
  • 8.0 Very good
  • Eli R
  • United States United States
Great diving, good to have nitrox!

Great sites but skip Phuket area.

Recommended for
Diving, variety of dive sites, trip leader
  • 9.6 Exceptional
  • Karly S
  • United States United States
Once in a lifetime experience

Highlights included: • New certifications • Beautiful scenery • Fun crew • Very knowledgeable divemasters • New friendships • Felt taken care of and safe • Amazing and abundant food

Recommended for
The entire crew was amazing, the dive sites were spectacular, and we had a fantastic group of divers!
  • 9.6 Exceptional
  • Stuart O
  • United States United States
Amazing and tons of diving. The food was spectacular!

The staff and people were amazing and the food far exceeded my expectations.

Recommended for
People, diving, food
  • 9.6 Exceptional
  • Adam B
  • United States United States
Trip of a lifetime!

Manta rays! The crew was fantastic and bent over backwards to help out in any way they could. The food was plentiful and amazing. Beautiful boat!

Recommended for
The crew, the food, the diving
  • 9.2 Superb
  • Chris W
  • United States United States
A fantastic week aboard a great boat

The crew, dive guides and other divers are what made this trip enjoyable. The Andaman sea is not abundant with macro life, so the diving was not my favorite but that being said, we had a fantastic trip. The boat and crew made it very fun.

Recommended for
We saw mantas and a whale shark. The crew was very friendly and helpful. The boat was very comfortable and the food was delicious!!
  • 9.2 Superb
  • Christine J
  • United States United States
Easiest to spot at every site!

The entire boat, crew and guests were super friendly and made the trip better. It was easy to sit and talk to anyone/everyone. The islands and sunsets were very photogenic. The only bummers were visibility (lots of plankton) and some strong currents but that means big pelagics, so it wasn't much of a bummer. I would definitely recommend The Phinisi (or Siren fleet) based on this trip.

Recommended for
1. The crew, both dive and boat were so helpful. When I had equipment problems they fixed them very quickly or swapped in rental gear. 2. The food! Si (the chef) made sure the vegetarians and celiacs had special food without compromising on quality or diversity. 3. The variety of underwater life! Mantas, whalesharks, turtles, sting rays, octopuses, reef sharks, all the triggerfish and so much more.
  • 9.6 Exceptional
  • Jeffrey L
  • United States United States
Great 10 Day Journey!

After missing out on Mantas on the northern part of our trip and expecting to not see any mantas at all, we spotted an absolute beauty unexpectedly that made the diving portion of our trip. Hats off to the crew who put up with us over Xmas and New Years - they were awesome and welcoming and really made our trip enjoyable!

Recommended for
Crew, Itinerary, Hospitality
  • 8.8 Fabulous
  • Kimberly H
  • United States United States
Crew made it worth it

The diving in the north with beach trips were great. The staff and crew were always very helpful and made it really feel like a vacation.

Recommended for
The helpfulness and the friendliness of the crew was awesome. The selection of food was great (if you like Thai food/seafood). The cabin was larger than other liveaboards I’ve been on.
  • 9.6 Exceptional
  • Arthur A
  • Canada Canada
Awesome diving, on a beautiful boat with a wonderful crew

Just back from an amazing 7D/6N dive trip aboard the Phinisi, visiting the Similan and Surin islands with my dive buddy. The best dive site (by far!!) was Richelieu Rock. We dove there four times, and I would have been happy to have just dived that site over and over. Our dive guide was Amelie, and she made sure to always find something cool and obscure on each dive. The rental gear was brand-spanking new, and so was pretty much everything else on this newly renovated boat. The boat is beautifully appointed, and we lacked for nothing. My buddy and I felt like kings, lavishly attended to do by the entire crew throughout our trip; from delicious and bountiful meals to assistance getting in and out of our dive gear. Deano’s dive briefings were entertaining and amazingly accurate. The whole team oozed experience and I highly recommend this boat, crew, and itinerary to anyone seeking to eat, sleep, dive, repeat :)

Recommended for
Richelieu Rock, Fun & Friendly people, impressive boat
  • 10 Exceptional
  • Alexander T
  • United Kingdom United Kingdom
Fantastic Trip

The whole trip was excellent. The crew were very knowledgeable and always happy to help. The food was perfect and the dive equipment and guides were top quality

Recommended for
Crew, food, equipment
  • 9.2 Superb
  • Ka eun L
  • South Korea South Korea
I'll try once again!

The first liveaboard in my life. It was not too long and not too short, 5 days and 4 nights. Storm was coming but we didn't worry about that, because of the stable crew and dive masters. I just really recommend this if you are on your first trip. Above all Sai's cooking will block sea sickness, I swear.

Recommended for
Friendly crew, fantastic food, safety check
  • 9.6 Exceptional
  • Bokrye C
  • South Korea South Korea
Comfortable diving trip

Staffs were very nice and kind. Feel like home. Facilities and systems are convenient. Foods are great.

Recommended for
Staffs Foods Diving orgarnization
  • 9.6 Exceptional
  • Petra D
  • Germany Germany
Best liveaboard i ever experienced.

Guides who know what they do. Dive with a whaleshark for 35 minutes. Dolphins swimming with the boat.

Recommended for
the crew, the boat, the dives
  • 9.6 Exceptional
  • Alexandre R
  • Switzerland Switzerland
A wonderful break

Turtles and wonderful dive sites. The stay onboard was also great with less divers than capacity and therefore made the cruise something special, privileged.

Recommended for
Dives, crew, boat
  • 9.6 Exceptional
  • Thomas S
  • Germany Germany
If you want to be sure that none of the other boats around you in the Similan Islands looks more spectacular and has a better crew, spend your week's diving on the Phinisi! Simply brilliant and I woul

My personal highlight, which showed the great level of organization and 'caring' of the owning company of the Phinisi, was when my entire dive equipment and luggage, which had been lost by the airline on the flight to Phuket, was handed over to me by the crew of the sister ship 60 offshore in the Andaman Sea. Unparalleled Service!

Recommended for
Excellent dive briefings and dive guides. Well-airconditioned cabins. A very versatile itinerary with a huge range of dive sites.
  • 9.2 Superb
  • eunjin S
  • South Korea South Korea
what a beautiful trip it is..^^!!!!!!

There were so many baracudas.... fish.. and beautiful creatures...^^!!! poeple on the board were very kind and attractive.. there crews are my good friends now^^

Recommended for
people, food, sea
  • 8.8 Fabulous
  • South Korea South Korea
Friendly crew likes liveaborad

Whale shark feeding and Jack Fish Barracuda's schooling

Recommended for
Friendly crew, diving system, diving point
  • 8.0 Very good
  • Petter K
  • Norway Norway
Great boat, good diving

Schools of baracuda!

Recommended for
Friendly crew, good diving, nice boat
  • 8.0 Very good
  • Petter K
  • Norway Norway
Great boat and staff.

Turtles and sharks

Recommended for
Boat, staff and diving
  • 10 Exceptional
  • Adrian H
  • United Kingdom United Kingdom
Look no further! This was one of the best diving experiences i've had to date.

Apart from the lucky visit by a 5m Manta Ray. Everything about this trip was perfect. I had planned to lose a bit of weight, However the food laid on was too good not to have seconds :). Super friendly crew and a very chilled and relaxed atmosphere all over the very spacious boat. Can't wait to return again to the Phinisi.

Recommended for
The dive sites were incredible, Pre dive briefings full of content. Boat comfort and crew was brilliant.
  • 10 Exceptional
  • Irina O
  • Norway Norway
Best experiences

This is one of my best experiences in my life. The boat was amazing. Cabins clean and very comfortable. Food was amazing, good mix between western and Thai food. Although we didn’t see any big fishes the diving was amazing. To do my AOW here was the best choice I’ve ever made. And all honor to my dive instructor, Ping. He made it so easy to complete my course, thank you. I’ll definitely come back sometime and will recommend this to all my dive buddy’s!

Recommended for
Food, dive sites, Ping
  • 8.8 Fabulous
  • Zbigniew L
  • Poland Poland
I am diver for many years.

I can't distinguish antything on this journey.

Recommended for
Food, Crew, manager of boat - Darren King
  • 8.0 Very good
  • jenny V
  • Norway Norway
Perfect holiday


Recommended for
The crew, boat and the food
  • 8.4 Very good
  • Angela W
  • China China
Enjoyed A Happy Week in The Phinisi

It was a happy and safe trip with this beautiful boat. We had total 5 DMs for 15 divers, each group being small and efficient.

Recommended for
Helpful crew members, well-organized daily activities, and efficient dive groups.
  • 9.6 Exceptional
  • David R
  • Canada Canada
Excellent Dive Experience In The Andaman Sea

I had a great experience during my 7 day liveaboard on the Phinisi. The dive sites were fantastic, if a bit crowded with divers from other boats. The Phinisi carries a relatively small number of divers, but some of the competing companies bring a lot of divers so it can get crowded. Our cruise director was good at avoiding the worst of the crowds. The reef life was fantastic. We had bad luck and didn't see any big pelagics, but that's uncontrollable. The dive instructors and dive masters were excellent. I enjoyed the food, a mix of Thai and western, it was tasty and there was more than enough. Overall the Phinishi made a good dive boat with all the necessary facilities. My one minor complaint - sharing 4 to a cabin wasn't the most comfortable, but we made it work.

Recommended for
Coral Reef Life
  • 8.0 Very good
  • Steven T
  • Australia Australia
Great diving and good information given from all on board particularly cruise director.

Unexpected manta sightings out of season.

Recommended for
Diving, boat crew and boat.
  • 8.8 Fabulous
  • Gustaaf B
  • Netherlands Netherlands
My first liveaboard trip. I had a wonderful experience.

Richelieu diving site.

Recommended for
The crew. The ship. Richelieu diving site.
  • 9.2 Superb
  • Robert W
  • United Kingdom United Kingdom

Amazing boat crew with faultless service and great diving.

Recommended for
Dive crew, Dive sites, The boat
  • 7.6 Good
  • Huseyin A
  • Turkey Turkey
Myanmar diving on Phinisi

Myanmar or Thailand is not a prime dive destination, in my opinion. Most often visibility is poor, reefs are not great. However, sightings of quitar and bamboo sharks were good. This trip with land-based excursions complemented is worthwhile.

Recommended for
Crew, food, dive preparetions
  • 8.4 Very good
  • dawn M
  • United Kingdom United Kingdom

Great boat,Great food you never went Hungary and all the staff went above and beyond to help with any problems we had. Gòd hob will highly recommend.

Recommended for
Variety food staff
  • 10 Exceptional
  • Ian F
  • United Kingdom United Kingdom
A wonderful way to spend Xmas and New Year

We were made to feel at home right away. Super experienced and friendly dive director and DM's made diving a relaxed and fun experience. Crew were amazing - every need catered for with a smile. Some truly world-class dive sites.

Recommended for
Brilliant Dive Crew and boat staff,Comfortable Boat,Great dive sites
Origin: US