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Dive beyond the usual in Hawaii with Fathom Five. Three guided dives off Niihau offer crystal-clear waters, vibrant reefs, and an exclusive boat experience from Koloa.
Dive beyond the usual in Hawaii with Fathom Five. Three guided dives off Niihau offer crystal-clear waters, vibrant reefs, and an exclusive boat experience from Koloa.
Book with Fathom Five Divers
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Operated by Fathom Five Divers · Koloa, Hawaii
Set off from 4637 Amio Rd in Koloa, Hawaii, for a diving journey that stretches beyond the usual Hawaiian adventure. Fathom Five Divers offers a rare chance to dive the crystal-clear waters surrounding Niihau, often called the Forbidden Island. This privately owned island is off-limits to most visitors, making it one of the most pristine marine environments in the state. From the deck of a custom-built 38-foot dive boat, guests embark on a three-tank dive experience tailored for certified divers looking to immerse themselves in untouched underwater landscapes.
The boat itself is outfitted specifically for Hawaiian waters, featuring full shade, advanced navigation, rinse tanks for sensitive gear, and space for fewer divers — ensuring an intimate, comfortable outing. The dives descend from depths of 85 to 105 feet initially, gradually easing to 45 to 65 feet on the final dive. Each underwater excursion reveals vibrant coral gardens, expansive drop-offs, and a chance to encounter native reef species rarely disturbed by heavy traffic.
Fathom Five’s knowledgeable crew guides divers with care and enthusiasm, providing a full site briefing, safety instructions, and steady support throughout the day. A light breakfast, snacks, and lunch onboard keep energy levels high between dives on this 11-hour trip running from mid-May through September. Equipment rental options are robust and well-maintained, extending from full dive packages to individual components for maximum convenience.
Beyond the dives, Niihau’s moon-shaped neighbor Lehua stands as an additional natural landmark, framing the horizon with sharp volcanic cliffs that hint at the ocean’s raw power beneath the calm surface. For scuba divers in Hawaii, this trip combines exclusivity, excellent underwater visibility, and a chance to witness some of the archipelago’s healthiest reef systems — a true standout in local outdoor recreation.
challenging.
11 hours.
Participants should be in good physical condition, comfortable with multiple deep dives and extended surface intervals.
Yes, all participants must hold an active SCUBA certification and be at least 15 years old.
Fathom Five offers a refresher option with a safety review and guided dive to bring you up to speed.
Full rental packages including wetsuits, tanks, and regulators are available, though you can bring your own mask, fins, and snorkel.
Three guided dives are included, ranging from 45 to over 100 feet deep, depending on which dive of the day.
A light breakfast, snacks, drinks, and a light lunch are included to keep you fueled throughout the 11-hour trip.
Trips occur Mondays and Thursdays from mid-May to September. Early booking is recommended due to limited spots.
Niihau is a privately owned island with restricted access, preserved to protect its natural environment and cultural heritage.
Fathom Five emphasizes sustainable diving practices, including reef-safe sunscreen use and strict adherence to no-touch policies to protect fragile reef ecosystems.
Fathom Five Divers is a Kauai-based dive operator located in Koloa, Hawaii, offering guided snorkel tours, shore dives, boat dives, and introductory SCUBA experiences. The company focuses on small-group instruction, personalized attention, and high-quality equipment to help guests explore Hawaii’s marine ecosystems safely and confidently. Trips range from guided snorkeling at Koloa Landing to multi-tank boat dives and specialty excursions exploring remote sites such as Niihau, the island commonly referred to as the "Forbidden Island." Instructors and guides provide pre-dive briefings, equipment support, and situational guidance tailored to varying skill levels, from first-time Discover SCUBA participants to certified divers seeking multi-tank adventures. Fathom Five’s boat operations include a custom approach to Hawaiian waters, with a noted 6-pack boat operation used for many boat dive trips and access to numerous local dive sites. Safety protocols, clear briefings, and condition-based decision-making are emphasized across shore and boat programs. Discover SCUBA options state a lower age limit for participation, and many shore dives are described as suitable for divers of all skill levels. Tour offerings include daylight and twilight/night options, shore and boat formats, and both single- and multi-tank schedules. Visitors looking for guided snorkeling or structured dive experiences in Koloa can choose from a diverse set of trips matched to skill level, time available, and interest in local marine life and topography.
Book with Fathom Five Divers