Submarine and glass-bottom boat tours off Waikiki

Not every way to see Oahu’s reef involves a mask and fins. Off Waikiki, two very different boats let visitors look underwater while staying completely dry: a real passenger submarine that descends below the surface, and a glass-bottom boat that stays afloat and shows the reef through a viewing hull in the deck. They get lumped together in marketing copy because both promise “see the ocean without getting wet,” but the experience, the time commitment, and the price are not close.

Both fit into a beach-focused stay without needing a rental car or a full day away from the sand, which makes them a natural add-on for anyone following a first-timer’s Oahu plan or a short two-day Waikiki highlights itinerary. If a car-free week in Waikiki is the plan, see the guide to Waikiki without a car for how a dock check-in fits around walking and TheBus.

How the submarine tour actually works

The submarine itself never docks in Waikiki. Passengers check in at a counter on land, usually near a pier or dock around the Hilton Hawaiian Village lagoon or Kewalo Basin, then board a surface shuttle boat that motors out to open water where the submarine is moored. That short boat ride is part of the package, not a separate cost, but it does add to the total time.

Once aboard, the submarine seats passengers along both sides facing outward portholes, in a narrow, low-ceilinged cabin. It descends to roughly 30 to 100 feet depending on the site and closes its hatch for the submerged portion, which typically runs 45 to 60 minutes. A narrator points out reef structure, fish, and often a sunken vessel or aircraft placed as an artificial reef. There is no surfacing early on request; the dive follows a fixed profile.

Counting check-in, the shuttle boat out, the dive itself, and the return, budget 1.5 to 2 hours total for the outing. That is longer, and priced higher, than the glass-bottom boat alternative, mainly because of the specialized vessel and the extra transfer leg.

Like most popular Waikiki activities, both tours are worth locking in ahead of the trip rather than treating as a walk-up option; the guide to booking ahead and what actually sells out on Oahu covers which categories of tour fill first. Prices quoted at the dock or online are typically before the general excise tax added at checkout, the same as most tours and hotel stays on the island — see resort fees and hidden costs for how that adds up across a trip.

How the glass-bottom boat differs

A glass-bottom boat is a conventional tour boat with a viewing hull built into the bottom of the deck, usually a sunken lounge area with thick glass panels. It departs directly from a Waikiki dock, without a separate shuttle, and stays on the surface for the entire trip. Passengers look down through the glass rather than out through portholes at eye level, so the field of view is narrower and the sense of being “underwater” is less immersive.

Trips run shorter, generally 45 minutes to an hour on the water, and cost noticeably less than the submarine. There is no enclosed hatch, no descent, and no fixed dive time to sit through, which makes it a lighter commitment for a short attention span or a nervous passenger.

	Submarine	Glass-bottom boat
Goes underwater	Yes, submerges	No, stays on the surface
Typical duration	1.5 to 2 hours total	45 minutes to 1 hour
Boat transfer required	Yes, shuttle to the sub	No, direct boarding
Enclosed space	Yes, sealed cabin	No, open-air deck
Relative cost	Higher	Lower
Best suited to	Curious kids and adults, calmer schedules	Short attention spans, mild claustrophobia

Who each one actually suits

Both formats were built for the same basic audience: people who want to see coral and fish without swimming. Non-swimmers, older travelers, and families with young children who are not confident in open water are the core market for both, and neither requires any water skill at all.

Where they split is tolerance for enclosed spaces and appetite for a longer outing. The submarine’s sealed cabin, narrow aisle, and fixed dive time can be genuinely uncomfortable for anyone with claustrophobia, and there is no option to ask for an early surface once the dive has started. If that is a concern, the glass-bottom boat is the more comfortable choice: open air, a shorter runtime, and no hatch closing overhead.

Families with a toddler should also check the submarine’s minimum height requirement before booking, commonly around 36 inches (91 cm), since a passenger needs to be tall enough to see out the portholes and move safely through the cabin. Glass-bottom boats are generally more forgiving on age, since seating is open-deck rather than a fixed porthole position.

Neither tour is the right pick for anyone who actually wants to get in the water. Snorkeling gear, boogie boards, and stand-up paddleboards launched from the beach are covered separately in the guide to water sports in Waikiki, and jet ski or parasailing trips are covered in the guide to parasailing and jet ski tours on Oahu. This page is specifically for people who want the view without leaving the boat. Travelers weighing accessibility more broadly, including mobility limits beyond claustrophobia, should also check the accessible Oahu guide before booking either vessel.

How they compare to other Waikiki boat trips

Both the submarine and the glass-bottom boat are single-purpose outings: they exist to show the reef, not to sail, snorkel, or watch a sunset. Waikiki has plenty of other boats doing the opposite. A catamaran sail off Waikiki trades the reef view for open water, wind, and often a sunset run, and the Friday fireworks cruise is timed specifically around the weekly Hilton fireworks show rather than marine life. Anyone deciding between a dinner-style outing and a straightforward wildlife trip can compare the options in the dinner cruise vs. luau and sunset cruises in Waikiki guides.

For travelers who do want to get in the water but are choosing between a beach lesson and a boat, the guide to snorkel tours vs. beach snorkeling and the broader snorkeling and diving guide to Oahu lay out the tradeoffs; first-time snorkelers nervous about open water sometimes start with the dry submarine or glass-bottom ride as a preview before booking a beginner scuba or beginner surf lesson later in the trip. From roughly November through May, some of the same boat operators around Waikiki also run whale watching trips from Waikiki during humpback season, which is a separate booking but a similar dock and boarding process.

An alternative that stays on the water but shifts the focus entirely is a Honolulu bottom fishing trip: rather than looking at fish through glass or a porthole, it puts a rod in your hands. For a small group that wants the boat ride itself as much as the reef view, a 3-hour Honolulu bottom fishing adventure departs from the same general Waikiki-area docks and suits travelers who’d rather fish than float over the reef.

What you will actually see

Visibility off Waikiki and the nearby south shore depends on recent weather and surf, and no operator can promise a specific animal sighting. What tends to be consistent is reef structure, common reef fish, and on most routes a sunken ship or artificial reef feature used as a stop on the route. Sea turtles and larger fish are a real possibility but not a guarantee on any given trip, submarine or boat.

If seeing a turtle up close is the main goal rather than staying dry, an actual snorkeling trip gets closer and more reliable views; the guide to Turtle Canyon snorkel tours covers that alternative directly, and the boat tour that combines snorkeling with a wildlife-focused route is bookable through a reef and turtle snorkeling boat trip from Waikiki. A smaller-group version of the same idea, capped at six passengers, is the sea turtle snorkeling boat tour, 6 people max, which suits travelers who want a quieter boat than the standard submarine or glass-bottom departure. For a private option that combines snorkeling with a wider wildlife-watching route around Oahu’s south shore, see the Waikiki private snorkeling and wildlife boat tour.

Booking, timing, and what to expect on the day

Submarine capacity is fixed by the vessel, typically around 48 seats per dive, and does not flex the way a larger tour boat can. In June through August, and again around the winter holidays, sailings can sell out several days ahead, so booking in advance is worth it rather than optional. Glass-bottom boats generally have more flexible capacity and shorter lead times, but a specific afternoon departure can still fill on a busy week.

Arrive at the dock with time to spare for check-in, a waiver, and a safety briefing before the shuttle boat or the boat itself departs; most operators ask for 30 to 45 minutes before the scheduled departure. Dress for a boat, not a beach: closed shoes or sandals with grip, a light layer, and sun protection for the open-deck portions, since the submarine’s air conditioning contrasts with a warm shuttle ride in both directions.

Sunscreen matters even on a short surface crossing, and Hawaii bans the sale of sunscreens containing oxybenzone or octinoxate statewide, so pack or buy a reef-safe formula before the trip rather than assuming any bottle will do; see reef-safe sunscreen and the ban for what to look for on the label.

Most operators check in passengers on land near the Hilton Hawaiian Village end of Waikiki or at Kewalo Basin, both an easy walk, TheBus ride, or short Biki bikeshare hop from most Waikiki hotels, so a rental car is not necessary just for this outing; the general getting around Oahu guide covers the options if the rest of the day includes stops farther afield.

Seasickness is a real, if minor, consideration on the shuttle boat leg and on the glass-bottom boat itself, more so from November through April when the ocean around Oahu tends to be choppier on the windward and north-facing coasts; the south shore near Waikiki is comparatively sheltered but not immune on a windy day. Anyone prone to motion sickness should consider timing and take precautions before boarding either vessel.

Neither ride requires a swim test, gear rental, or prior experience, which is the appeal: for a non-swimmer, a family with a hesitant six-year-old, or a traveler who simply wants an easy hour on the water in Waikiki, these are the two lowest-effort ways to see what Oahu’s reef looks like from below, or through, the surface.

For a wider view of what else fills a beach day in Waikiki, including boards, kayaks, and other on-water activities, see the guide to water sports in Waikiki, or browse boat-based options more broadly in the snorkeling and diving guide to Oahu.

Where this fits in a Waikiki itinerary

Both tours pair naturally with a half-day already built around the beach, since neither requires changing into swim gear or rinsing off afterward. A common pattern is a morning submarine or glass-bottom boat departure followed by an afternoon at the beach, a Diamond Head hike, or a walk through Waikiki’s historic sites; see the Waikiki attractions and tickets guide for how to sequence a full day. Families splitting a trip between Waikiki and a half-day at Pearl Harbor can check the Pearl Harbor from Waikiki transport guide for timing, since both outings involve an early dock or gate check-in and are easiest not to stack on the same morning.

Anyone still deciding how many days to spend in Waikiki versus the rest of the island can see the how many days on Oahu guide and the three days, first-timers itinerary, both of which treat a short water activity like this as a half-day slot rather than a full day.

Submarine and glass-bottom boat FAQ

Do I need to know how to swim for these tours?

No. Both the submarine and the glass-bottom boat keep every passenger dry and seated, which is why they suit non-swimmers and families with young children.

Is the submarine safe for someone who is claustrophobic?

It can be uncomfortable. The cabin is a sealed metal tube with a narrow aisle and portholes rather than open views, and it stays submerged for a set period without the option to surface early. If enclosed spaces are a problem, choose the glass-bottom boat instead.

How long does the whole submarine trip take, including the boat ride out?

Plan on roughly 1.5 to 2 hours door to door: check-in at the Waikiki dock, a shuttle boat out to the dive site, the 45 to 60 minute submerged portion, and the return.

How much does a glass-bottom boat cost compared to the submarine?

The glass-bottom boat runs shorter, usually 45 minutes to an hour on the water, and costs noticeably less than the submarine, which prices in the specialized vessel and the shuttle boat transfer.

Where do these tours leave from?

Both depart from a dock or pier around Waikiki, most commonly near the Hilton Hawaiian Village lagoon or Kewalo Basin. Check-in is on land; the submarine passengers then take a short shuttle boat out to open water where the submarine itself is moored.

Should I book in advance?

Yes, especially from June through August and around the winter holidays. Submarine capacity is fixed at around 48 seats per dive and sailings sell out days ahead in high season.

What will I actually see underwater?

Reef structure, tropical fish, and sometimes a sunken ship or aircraft replica used as an artificial reef. Visibility and marine life vary with weather and season, so treat any specific sighting as a possibility, not a guarantee.

Can babies or toddlers go on the submarine?

Most operators set a minimum height requirement, often around 36 inches (91 cm), because passengers must be able to see out the portholes and move through the cabin. Check the specific tour’s requirement before booking with an infant or toddler.