Big Sister's Island House Reef – Sister's Islands Marine Park Dive Site

10m Max

3-8m Vis

boat

Site Overview

Big Sister's Island House Reef is one of Sister's Islands Marine Park's most rewarding dive sites, offering a shore-accessible reef slope with sea stars, seahorses, juvenile angelfish, and harlequin shrimp, excellent for training and macro photography. The site's healthy marine ecosystem supports diverse fish populations and vibrant coral formations throughout the diving season, creating an underwater landscape that rewards repeated exploration. With consistent water temperatures of 27 to 30 degrees Celsius and visibility ranging from 3 to 10 metres depending on conditions, Big Sister's Island House Reef provides excellent conditions for underwater exploration and macro photography across all certification levels. The site's diverse topography creates multiple habitat zones supporting different species at various depths, from shallow coral gardens teeming with juvenile fish to deeper sections where larger species patrol the structure. Singapore's strategic location at the crossroads of Southeast Asian marine biodiversity ensures rich species diversity with both Gulf of Thailand and South China Sea influences contributing to the marine communities. Nutrient-rich waters sustain abundant filter-feeding invertebrates including gorgonian sea fans, sponges, and crinoids that add color to the underwater scenery. The macro life diversity at Singapore dive sites makes them particularly rewarding for underwater photographers and naturalists who appreciate the abundance of small cryptic species. Whether searching for seahorses among the coral bommies or observing larger pelagic visitors, Big Sister's Island House Reef delivers memorable underwater experiences throughout the diving season.

Dive Briefing

"Begin the dive at the shallowest point of Big Sister's Island House Reef and take a moment to orient yourself before descending along the shore-accessible reef slope. Maintain excellent buoyancy throughout the dive to protect the fragile coral formations and diverse marine life inhabiting the reef structure. Swim along the formation exploring the various depth zones while observing the diverse habitats and marine species that occupy each zone. Check overhangs, ledges, and crevices for resting moray eels, lionfish, and cryptic critters that shelter from the current. Pay special attention to the coral bommies and sandy patches where smaller species like seahorses, frogfish, and nudibranchs can be found with careful observation. Monitor your depth and remaining NDL carefully throughout the dive and maintain conservative ascent profiles. Keep your dive buddy in visual contact and communicate regularly using standard hand signals. Complete your safety stop at 5 meters deploying your DSMB before surfacing near the boat, watching for boat traffic overhead during your ascent."