Latest Big Blue News From The Similan Islands

Chevron Barracuda Shoal

MV Hallelujah Similan Liveaboard 14 Dec – 18 Dec 2017

Picture of Big Blue Diving Khao Lak
Big Blue Diving Khao Lak

There are many dive sites in the Similans & Surin National parks and over the years we have dived them all, but which one is it that we simply love…

If the weather prevents us from diving a scheduled destination then we have the knowledge & flexibility to adjust and dive at a different location but there are a few we just love to dive as often as possible; Koh Tachai Pinnacle is one of these sites.

The pinnacle lies a few hundred meters off the coast of Koh Tachai and can be pretty unpredictable at times particularly if the tidal differences are great. To use a simple analogy – Koh Tachai Pinnacle is much akin to my ex wife, she is absolutely beautiful, can present some amazing surprises but can also be pretty nasty!

Koh Tachai is without a doubt a stunningly beautiful dive site, the main pinnacle being a large dome surrounded by clusters of large boulders to the East and South petering off into the depths, smaller rocks and boulders to the West where the large fans and fauna begin to take shape, leading round to the North where the foliage becomes even greater in numbers and size. To the North there is a second smaller pinnacle but slightly deeper than the average depths around the dome itself. The North is where I like to hang out, particularly if my customers have an interest in photography, the varying fans and soft corals lay particularly well for wide-angle shots and are home to a plethora of macro species.

Chevron Barracuda Shoal

Day 2 of the trip and the last dive of the day, the tidal information tells us that it may be a bit rippy on descent and we all brief our groups ready for a buoy line descent only to find that as soon as we hit the water the tidal information was completely off, not a jot of rip, just a gentle nudge in the right direction as we descended onto the dome. With the visibility at around 20m and a lovely late afternoon blue tinge we headed for the Northern section and mooched around the fans finding macro and reef fish alike. Overhead the Giant Trevallies, Rainbow Runners & Spanish Mackerel where stalking through the schools of fish who where trying to catch a last minute nibble before retiring for the evening. Sudden bomb bursts of fish as the GT’s hone in and accelerate upon their prey. The show was simply amazing, we shallow up and whilst mooching through the smaller rocks and corals for macro we found ourselves distracted from macro hunting and hovering over the dome for a good ten minutes watching the display of nature around us, with the sun radiating down from the surface through the inky blue water this surely was one of Koh Tachai’s great dives.

Usually we find that some customers decide to sit this dive out as it’s the last dive of day 2 and the weary traveler is being enticed by the idea of a beer and a relax. Top tip…….wait a little longer, have some electrolyte and hit the bar after diving one of Thailand’s greatest sites.

Thank you all for a great trip, hope to see you again.

Big Blue Divers

Previous Posts

Living Blue
Eve Pilmore

2025 Recap: Big Blue Diving Khao Lak × Andaman Turtle Watch

As 2025 comes to a close, we reflect on an extraordinary year of collaboration between Big Blue and Andaman Turtle Watch. From leading the region in citizen science submissions to launching the Andaman Sea’s first public sea turtle photo-ID database, this partnership shows what’s possible when conservation is embedded into everyday diving. The data, the discoveries, and the turtles tell a powerful story – and this is only the beginning.

Read More »
Living Blue
Eve Pilmore

Big Blue Diving X Andaman Turtle Watch

Adventure meets conservation! Big Blue Diving Khao Lak played a leading role in Andaman Turtle Watch’s début season, driving sea turtle research, creating turtle-trips, and launching the first public ID database.

Read More »
Spawning corals in the Similan Islands
Similan Updates
Boots

Coral Spawning in the Similan Islands: A Natural Wonder

Coral spawning around the Similan Islands is one of nature’s most incredible spectacles. Each year, during the full moons of March and April, corals release eggs and sperm into the sea, ensuring the reefs’ regeneration and supporting the region’s rich marine biodiversity. This synchronized event is vital for the future health of the Similan reef ecosystem.

Read More »

The Big Blue Shop

Sharkskin Titanium Chillproof Long Sleeve Full Zip Male

Sharkskin Titanium Chillproof Long Sleeve Full Zip Male

9,856฿

xdeep-closed-dsmb-narrow-buoy

X deep closed narrow DSMB

Original price was: 2,770฿.Current price is: 2,220฿.

Deep Blue Safety Balloon

Deep Blue Safety Balloon

350฿

Scubapro Go Sport Fins

Scubapro Go Sport Fins

Price range: 2,438฿ through 4,875฿

Womans Sharkskin Titanium Jacket Front

Womans Sharkskin Titanium Jacket

12,710฿

Sharkskin Titanium Chillproof Hood

Sharkskin Titanium Chillproof Hood

2,516฿

Scubapro Nylon SMB

Scubapro Nylon SMB

Price range: 3,305฿ through 3,535฿

Sharkskin Titanium Chillproof Long Sleeve Full Zip Female

Sharkskin Titanium Chillproof Long Sleeve Full Zip Female

9,856฿

With Big Blue Diving Khao Lak

For divers who live and breathe the ocean lifestyle – spending days at sea, diving pristine reefs, and naturally wanting to protect the incredible marine world we’re passionate about.

Shell Yeah in blue text

Turtle Conservation Trips

We’ve partnered with Andaman Turtle Watch to offer an unique 4-night conservation-focused diving experience in the Similan Islands. These educational expeditions combines our renowned diving standards with hands-on turtle research opportunities.

Perfect for divers seeking an educational adventure that makes a difference.

Our Turtle Database

Meet the individual turtles we track with Andaman Turtle Watch. Each profile tells a unique conservation story—from first sighting to ongoing research. See citizen science in action.

Photo Gallery and Fish I.D.

Thailand’s crystal-clear waters harbour an extraordinary diversity of marine life, from the vibrant coral gardens of the Andaman Sea to the pristine reefs surrounding the Similan Islands.

Hiby's Lamellarid

Join our community of ocean-obsessed divers. Get first news of turtle conservation expeditions, marine research opportunities, and exclusive Living Blue adventures straight to your inbox.

Living Blue Newsletter Signup

* indicates required

Intuit Mailchimp