TK1

TK1 — the first of three adjacent dive sites named for Teluk Kembahu, a bay on the Lembeh Island side of the strait — is one of the most productive beginner-friendly muck sites in Lembeh Strait, North Sulawesi, Indonesia. The TK sites collectively make up one of the most-dived sections of the strait, and TK1 is often the first stop on a multi-site day trip for visiting divers getting their muck diving legs.

Overview

The site presents a classic Lembeh muck profile: a gently sloping black volcanic sand bottom scattered with rubble patches, low-profile sponges, and occasional pieces of discarded debris that serve as habitat for small critters. The slope angle is gentle, making navigation easy and depth management straightforward. Visibility averages 8–15 meters. Currents are typically minimal, and the protected bay setting ensures calm conditions on all but the roughest weather days. Water temperature runs 26–29°C year-round.

Site Information

• Location: Lembeh Strait, North Sulawesi, Indonesia
• Entry Type: Boat dive
• Site Type: Muck dive
• Difficulty Level: Beginner
• Maximum Depth: 25 meters
• Typical Visibility: 8–15 meters (25–50 feet)
• Current: Minimal to light
• Best Time: Year-round; October to May for calmest conditions

Marine Life

TK1 is particularly well-regarded for ornate ghost pipefish, which drift near feather stars and black-sand patches in a range of colour morphs — black, red, and spotted individuals are all regularly found here. Seahorses are consistent sightings, and dive-the-world.com notes mandarinfish (sea moths and dragonets) at the Teluk Kambahu area. Nudibranchs are abundant and diverse across the slope. Frogfish occupy rubble patches and encrusted debris in multiple colour phases. Scorpionfish and flying gurnards are documented at TK1. Ribbon eels are occasionally spotted retreating into sand burrows, and coconut octopus carrying shells are regularly found in the rubble zones. Banggai cardinalfish, which are endemic to the Banggai Archipelago but have been introduced to Lembeh through the aquarium trade, are also documented in the area.

Dive Profile

Begin the dive at the top of the slope in 10–12 meters and work gradually deeper, following the contour of the sand. The most critter-dense zones tend to be between 12 and 20 meters where rubble and sponge patches are most concentrated. The upper slope above 10 meters is excellent for nudibranchs and makes a productive safety stop area. A typical dive covers a slow, methodical transect of 50–80 meters of bottom distance at most — muck diving is about quality of observation, not distance.

Entry and Exit

Access is by banca boat from resorts along the Lembeh Strait. Entry via back roll or giant stride into calm bay water. Navigation follows the slope contour with the guide leading. Surface with a deployed SMB for boat pickup.

Tips and Recommendations

• TK1, TK2, and TK3 are often combined into a single extended dive or consecutive dives on the same day — discuss the plan with your guide beforehand
• Ornate ghost pipefish blend perfectly into feather stars — ask your guide specifically for them if that is your target
• A focus light or video light significantly improves critter-spotting ability in the darker mid-slope areas
• Beginners benefit from practising perfect buoyancy here before moving to deeper or more challenging sites in the strait
• Move at a slow, methodical pace — lingering over a single patch of rubble for 10 minutes often reveals more than covering the entire slope quickly

Safety Considerations

TK1 is one of the most accessible and low-hazard sites in Lembeh. The main consideration is silt disturbance — fin kicks that stir the black volcanic sand reduce visibility quickly and can mask critters for divers behind you. Practise a frog-kick or modified flutter-kick to minimise bottom disturbance. Blue-ringed octopus are present across all Lembeh sites; never handle any octopus. Always carry an SMB for surface signalling.

Photography

TK1 is an ideal introductory macro photography site. Ornate ghost pipefish are among the most photogenic subjects in Lembeh — the intricate fin detail and cryptic colouration reward patient close-up work with a 100mm macro lens. Seahorse portraits are a staple. The site’s gentle slope allows photographers to position themselves without fighting current or depth pressure. Shooting supermacro is possible here with wet dioptre attachments for the smallest nudibranch species.

Sources: NAD-Lembeh Resort Diving, Lembeh Resort – Muck Diving Guide, Dive-the-World – Lembeh Diving, ZuBlu – Lembeh Strait, Starfish – Lembeh Dive Sites. Last updated 2026-06-14.