KOLOA BOAT RENTAL FIELD GUIDE
Three Dives to the Forbidden Island: A Full‑day Boat Adventure from Koloa to Niʻihau
A guided, 11‑hour boat dive run by Fathom Five Divers that makes three dives around Niʻihau and nearby Lehua, useful for planning timing, depths, and what the operator provides.
Three Dives to the Forbidden Island: A Full‑day Boat Adventure from Koloa to Niʻihau.
Adventure brief
Three Dives to the Forbidden Island: A Full‑day Boat Adventure from Koloa to Niʻihau
Fathom Five Divers runs a one‑of‑a‑kind, full‑day boat diving excursion from Koloa to the forbidden island of Niʻihau and its moon‑shaped neighbor Lehua. The trip centers on three guided dives in remote, clear Hawaiian water aboard a custom‑built dive boat, and includes a light breakfast and snacks for the day.
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.
Route Schematic
Route & Itinerary Schematic
A typical day follows a morning transit to Niʻihau and Lehua with three planned dives at progressively shallower depths before returning to shore.
Morning Transit to Niʻihau/Lehua
Depart for Niʻihau and nearby Lehua aboard the operator’s custom dive boat to reach the remote dive sites.
First Dive — 85' to 105'
The first guided dive is the deepest of the day, typically in the 85–105 foot range.
Second Dive — 60' to 85'
The second dive moves into intermediate depths, generally around 60–85 feet.
Third Dive — 45' to 65'
The third and final guided dive is the shallowest, commonly 45–65 feet, before returning to the boat for the trip back.
Participants must meet the operator’s age requirement; see restrictions for limits and any additional health or certification requirements.
Highlights
Outing Highlights
Custom 38' Dive Platform Built for Hawaiian Water
Fathom Five runs the trip on a 38‑foot dive boat designed for comfort and small groups, with full shade options and amenities intended to make long days offshore more comfortable.
Three Guided Dives Across Progressive Depths
The itinerary comprises three guided dives at progressively shallower depths—first roughly 85–105 feet, then 60–85 feet, and finally 45–65 feet—allowing divers to experience a range of underwater terrain and conditions.
Remote Access to Niʻihau and Lehua
This outing affords access to Niʻihau and nearby Lehua, offering some of the operator’s most prized dive sites with fewer people than other operators visit.
What the day feels like
What the Day Feels Like
It’s an early start and an all‑day affair: the boat heads out from the Kauaʻi coast to Niʻihau’s waters for three guided dives, with a light breakfast and snacks served aboard so divers can focus on the dives and the remote marine environment.
Suitability
Who it's for
Who this trip suits — and who should reconsider.
Practical planner
Details to review before reserving
Operates mid‑May through September on Mondays and Thursdays with a 6:00 a.m. departure; total trip duration is approximately 11 hours.
A light breakfast and snacks are provided aboard the boat; the vessel includes amenities such as shade options and camera rinse tanks for dive photography.
Bring any personal dive equipment and cameras you plan to use; the operator lists camera rinse capability aboard the boat.
Review cancellation policies before reserving.
Frequently asked questions
Planning Your Outing
How long is the trip?
The outing is an approximately 11‑hour boat day.
When does the trip run?
Trips operate mid‑May through September on Mondays and Thursdays with a 6:00 a.m. departure.
What age is allowed to participate?
Participants must be at least 15 years old.
How many dives and how deep are they?
The trip includes three guided dives: the first around 85–105 feet, the second 60–85 feet, and the third 45–65 feet.
Where does the boat go?
The boat transits to the waters around the Forbidden Island of Niʻihau and nearby Lehua for the dives.
What amenities are on the boat?
The operator’s 38‑foot dive boat offers full shade options, navigation systems, entertainment features, and camera rinse tanks; a light breakfast and snacks are provided.
How this guide was prepared
This field guide is synthesized using verified supplier specifications, route descriptions, and destination data. Some booking links may generate affiliate revenue for ADV Guides.
- Verified: 2026-08-28T01:47:30.644Z
Some booking links may generate revenue for ADV Guides or The Adventure Collective.
Availability, pricing, schedules and operating details can change.
Trip details and contextual sources were reviewed by ADV Guides Editorial.