Bright pink nudibranch spotted diving Mabul Island

World famous muck dive destinations.

When diving Mabul, Kapalai & Si Amil you can expect to find incredible macro marine life, beautiful reefs and a huge number of nesting sea turtles. There is no shortage of subjects here; a dream destination for underwater photographers.

Mabul Island is the most populated island. In Mabul you can find many dive resorts, a large local community and nomadic Bajau Laut. World renowned for dives on the sandy seabed where avid divers search for strange critters!


Kapalai Island is a sand bank with a dive resort built over the top of the sand on stilts. However, it has a huge surrounding reef and is excellent for scuba diving.


Si Amil Island is further east and less frequented by tourists compared to other islands in Semporna. For diving & snorkeling, it is arguably the best! Fantastic macro, turtles and a chance for a thrilling encounter with schooling devil rays.

BIGFIN DIVERS Dive site map Semporna Islands; diving Mabul, Kapalai, Mataking, Si Amil, Tun Sakaran marine park, Sipadan Island.

Diving Mabul

LOBSTER WALL – PANGLIMA

The deepest drop off when diving Mabul, this vertical shelf descends down to an impressive 80 meters. Over-hangings dripping with orange and yellow soft coral. Plenty of nooks and crannies to search for the macro life of Mabul, hiding in the dark rocky crevices. An astonishing array of colorful nudibranchs cling to the wall.

Descend deeper and follow cascading fish down the wall to encounter a stunning secret cave wall with flourishing soft corals and sea fans. Down at 25 meters, the famous tiny pygmy seahorse of Mabul can be spotted in the pink sea fans. Remember, keep an eye in the blue for large pelagic that could swim up from the depths and surprise you.

RIBBON VALLEY – EEL GARDEN – STINGRAY CITY

So called for the field of garden eels wriggling and waving on the flat sandy bottom. A gentle sloping reef where you are guaranteed to see several giant green sea turtles sleeping. Hunt in the sloping sandy patches on the reef for stick pipefish, flying gurnard and strange sea moths!

As you drift further down the reef, spotted sting rays hide under rocks and Kuhl’s rays bury under the sand. Large banded sea kraits dive down in search of food, and green and hawksbill sea turtles swim up for a breath of air and schools of shimmering bat fish follow their trail. Search on the white sandy bottom for camouflaged flat headed crocodile fish. Look for the three ribbon eel color variants. They shift from black to yellow and blue as they mature. A great easy site for all divers to enjoy.

ARTIFICIAL REEF & SEA VENTURES, MABUL

In Mabul, many huge underwater structures have been built on the sandy bottom, and marine life is thriving around them. The artificial frames are now barely recognizable, covered with multi coloured sponges, feather stars and soft corals. Frogfish love to perch, dangling their lure to attract a meal, whilst delicate ornate ghost pipefish drift between the feather stars. Be sure to peep inside the structures where gigantic groupers lurk. If you notice a dark cloud in the distance, swim toward it. This is likely the huge school of resident jack fish. 

​Above water, Sea ventures is a repurposed oil rig turned hotel. Below the surface, an underwater junkyard that has become another spectacular artificial reef. No, it is not exactly pretty (think toilet bowls with giant moral eels coiling inside), but it is an awesome and highly interesting dive! Not only does it have an array of great macro life, it is also a very fishy dive, with plenty of schooling snapper and a big school of resident bat fish to entertain you on your safety stop. A favorite among dive crew, this is a site to remember!

PARADISE 1 + 2, MABUL

Macro mania! This is the most famous spot to site macro in Mabul, and will surely turn ever the most skeptical into a muck dive enthusiast! Primarily a sandy bottom dive with sporadic buoys, tires and tree roots for reference, you can find all manor of crazy critters here. Blue ringed octopus, pygmy pipe horse, Ambon scorpionfish and the fabulous flamboyant cuttlefish! And if you really can’t get into the macro, you will undoubtedly be at peace with the lazy GIANT green sea turtles snoozing on the seabed.

Look for giant frogfish on the sponges and minute Lembeh Seadragon on the rocky part of the reef. Visit at sunset to see the spectacular display from the petrol coloured mandarin fish as they perform their courtship dance. If you swim off the shallow reef you will also discover several small sunken wrecks, where giant pharaoh cuttlefish and schools of Bigfin reef squid have made home.


Kapalai Diving

KAPALAI HOUSE REEF

Arguably the best Kapalai dive sites are actually man made. Kapalai resort has worked for over 15 years to built what is now a huge artificial reef over the sandy bottom in front of the resort. The tall metal structures, ropes and sunken wrecks have become a haven for fish, now supporting an incredible diversity of both big and small macro marine life. Giant octopus, broad club cuttlefish, mantis shrimp, soft coral crabs, Indian ocean walkman, clown frogfish, grumpy stonefish, there are so many subjects that you will not know what to photograph first! Before you ascend, say hello (but don’t get too close), to the monstrous giant moray eel living under the jetty.

MID REEF, KAPALAI

Mid reef is a low pinnacle submerged in between diving Mabul and Kapalai. The sandy flats are home to bottom dwelling creatures such as sting rays, garden eels, Indian ocean Walkman, winged pipefish and tiger tail seahorse. Head to the shallow top part of the reef for schooling barracuda, jacks and squads of Bigfin reef squid in formation. Look carefully on the many whip corals to find minute dragon and Zanzibar shrimp.

BLACK RAY CHANNEL, KAPALAI

At this site, the current runs through a large sandy channel, dividing two elongated coral reefs. As you cross the channel, look out for Jenkins rays resting on the sand, or Eagle rays gliding past. The shallow reef is home to juvenile reef fish; such as the cute dancing harlequin sweetlips and distinctive juvenile rock mover wrasse. Swim over the edge of the deeper secondary reef to chance spotting something big, schools of devil rays and even thresher sharks have been known to make appearances here!


Si Amil Diving

1ST BEACH, SI AMIL

A sloping sandy bottom that is a dive photographers true treasure hunt. Similar to diving Mabul, this is a fantastic muck dive, where you can trawls the bottom for critters such as cockatoo wasp fish, Ambon scorpion fish, flying gurnard, coconut octopus, frogfish and sea moths. Explore the shallow reef around the jetty in the late afternoon to encounter tiny petrol colour mandarin fish and picturesque dragonets. Plan for a 90 minute discovery dive!

2ND BEACH, SI AMIL

We recommend this site for advanced level divers as one should dive to 30 meters to get the best from this site. Free descend down into the blue above a cleaning station below at 35 meters. If you are lucky you will encounter the hundreds for schooling devil rays that frequent this submerged reef. Keep a look out for menacing great barracuda and pelagic fish racing past such as giant trevally, Spanish mackerel and silvery pompano. As you are getting close to your bottom time, fin back to the reef and glide in the shallows over bountiful pink and yellow stretches of soft coral.

3RD BEACH SI AMIL

An extensive drift dive over a sloping reef, with coral bommies covered in bright sponges and delicate feather corals. Encounter huge banded sea kraits here, they are highly venomous but don’t worry, they are not at all aggressive! Look carefully in the intricate gorgonian sea fans in deeper waters to spot minute pygmy seahorse. We recommend to bring a magnifying glass!

MEDITATION WALL, SI AMIL

A beautiful steep wall dive. This is an outer wall situated submerged in the deep channel between the two islands of Si Amil and Danawan Island. Search on the wall for an array of colorful nudibranchs, you are almost certain to spot a new species of nudibranch here! Remember to look into the blue as there is a good chance to see eagle and devil rays gliding past.

Check out our rates for diving Mabul, Kapalai and Si Amil!