Rhodes Town’s underwater show is short, simple, and surprisingly fun. I like the air-conditioned comfort inside the Poseidon Submarine and the 360° panoramic underwater windows that make the Aegean feel close-up. One thing to plan for: the audio and seating downstairs can be hit-or-miss depending on crowding and conditions.

You’ll leave Mandraki Harbor with quick city views, then spend the main part of the trip watching fish feed right outside the windows. If you’re expecting a long underwater experience, this isn’t that. But if you want a good-value taste of Rhodes from sea level and underwater, it fits nicely.

Key Highlights to Watch For

• Mandraki Harbor departures with classic Rhodes views from the water
• Pass the Knights’ Palace area and the Old Town walls as you cruise
• 360° windows with underwater viewing from inside the cabin
• A diver feeding fish right in front of your window for easy viewing and great photos
• Option to step onto the deck for sea breeze and town angles
• Onboard bar access to make the short ride more pleasant

A 45-Minute Submarine Cruise That Still Feels Like a Real Experience

This is the kind of Rhodes activity that works on travel days when you don’t want a half-day plan. You’re on the water for about 45 minutes total, and it’s paced so you’re not stuck waiting around. You get a bit of sightseeing, then the underwater part does the real job.

The Poseidon Submarine keeps you watching from inside. The hull that provides the underwater observatory sits about 2.5 meters below the surface, while the vessel stays above sea level. That means you’re not dealing with the same motion you’d get on a small boat, and it’s easier to keep your attention on the fish and scenery rather than your balance.

At roughly $23 per person, this is priced as a budget-friendly “do something memorable” option. It also includes an onboard bar, and you get an audio guide (English and German) plus live commentary in English.

Finding Poseidon Submarine Fast in Mandraki Harbor

Your starting point is Mandraki port, at Poseidon Submarine, opposite the Bank of Greece building. It’s a central meeting area in Rhodes Town, so you’re not crossing the island or hunting for a far-out pier.

The cruise begins from Pl. Eleftherias (85100), then you’re moving through the harbor zone quickly. That quick rhythm matters because the total time onboard is short. You’ll want to arrive with enough time to check in and settle before the boat departs.

If you’re traveling with kids, this location is a bonus. It’s easy to pair this with a wander in Rhodes Old Town afterward, without feeling like you’ll be racing your schedule.

From Mandraki to the Knights’ Palace: Views You Don’t Get on Foot

Even before you reach the underwater viewing, the boat gives you an angle on Rhodes Town that’s hard to replicate from streets.

Here’s what the cruise route focuses on:

• Mandraki Harbour (a quick harbor cruise segment)
• The Palace of the Grand Master of the Knights of Rhodes area
• Old Town, Rhodes (a brief stretch by the historic shoreline)

What makes this part worthwhile is not that each stop is long—it isn’t. It’s that you’re seeing the city’s edges and fortifications from the water. That’s where Rhodes starts to click visually. The Old Town walls look more solid from sea level, and the harbor area reads like a real working gateway rather than just a pretty promenade.

Plus, the route is set up for you to glance at major points along the way, including the area where the Colossos of Rhodes once stood, the Elli beach stretch, and the Tourist Harbor. If you like building a mental map while you’re on vacation, this kind of “moving overview” helps.

Riding Inside the Cabin: Air-Conditioned Comfort and 360° Windows

The Poseidon Submarine has an air-conditioned viewing cabin below the surface. That matters in Rhodes, where the sun can go from friendly to intense fast. When you’re inside, you can stay comfortable while watching the underwater world through huge windows.

You get 360° panoramic viewing, which is a big deal for something this short. Instead of staring at one narrow window, you can turn as the submarine moves and catch fish from different angles. The result is that the underwater portion feels more active, even when you’re stationary in your seat.

There’s also a simple choice in how you experience it:

• Stay inside for the clearest viewing comfort
• Walk onto the deck for sea breeze and town angles from above

One practical note: some people find the downstairs area warm or cramped at peak times. If you’re sensitive to heat, plan to split your time—watch underwater inside, then take short deck breaks.

The Underwater Highlight: The Diver Feeding Fish

The main attraction is the diver feeding fish right in front of the windows. This is the moment the trip turns from “nice scenery” into “wow, I can actually see them.”

The feeding happens after you’ve settled in the cabin, and the feed draws in hundreds of multi-colored fish. That gives you two advantages:

1. You don’t need to be a marine expert to enjoy it.
2. Fish come to you, so visibility moments turn into photo moments instead of long waiting.

If you like nature viewing but don’t want a long boat day, this is a great setup. The windows do the work for you. You’re watching underwater behavior at a safe distance, from a controlled ride.

Also keep your camera ready. When the diver enters the water, it’s usually when the best concentrations of fish appear close to the observatory windows. People who are there for kids especially tend to remember this part as the “everyone leaned forward” moment.

The 18:30 Cruise Note: No Diving Show at That Time

One schedule detail matters: the 18:30 cruise doesn’t include a diving show.

So if you’re booking late evening and you specifically want the full “diver enters the water” moment, check the time carefully before you commit. If you’re okay with underwater viewing without that added show component, it can still be a worthwhile ride—but your expectation should match the schedule.

Audio on Board: Helpful History, But Volume Can Vary

You get an audio guide in English and German, plus live tour guide commentary in English. For a short trip, that’s a good mix. The commentary helps you connect what you’re seeing—Old Town walls, the harbor, and major landmarks—with a few context points so it feels more than just scenery.

That said, audio quality depends on the boat’s setup and the crowd. Some people found the commentary hard to hear at times, and one factor is that onboard sound can get mixed with music.

My advice: if the audio matters to you, sit toward the front/clearer seating area and avoid areas where the sound seems drowned out. For history buffs, it’s still a solid sampler, but don’t expect a museum-level lecture.

Getting the Best Views: Seat Strategy and Timing

Since the cruise is short and the submarine is compact, where you sit changes your comfort.

A few practical strategies:

• If you want the coolest air and easiest viewing, stay inside for the main underwater period.
• If the cabin feels warm or crowded, take short deck breaks to reset.
• Bring a small towel or wipes if you’re picky about window clarity, because window cleanliness affects what you can actually see. Some people reported very clear viewing, while others noted windows could be dirty.

Also, be ready to adapt when the fish feeding starts. The diver’s timing influences where fish gather. If you keep moving your viewpoint around the windows, you’ll usually get more variety than if you stare in one spot.

What’s Included (and What You’ll Pay Extra)

This cruise includes:

• The submarine cruise
• Audio guide in English and German
• Onboard bar access

Not included:

• Drinks beyond bar access (you’ll still pay onboard)
• Personal expenses

Even with drinks not included, it’s still strong value because the experience is structured: sightseeing from the harbor plus a guided underwater viewing highlight. You’re paying for a mix of views and the diver-and-fish moment, not just a long boat ride.

Who This Submarine Cruise Is Best For

This is a good match for:

• Families with kids who want something short and visually rewarding
• Couples who want a different angle on Rhodes without committing to hours at sea
• Nature lovers who want underwater viewing without the gear, training, or long day
• Anyone who likes quick history context but also wants a hands-on-feeling highlight

If you’re looking for lots of different habitats or a deep, varied marine itinerary, this won’t fully satisfy that expectation. A few people noted the underwater viewing can feel focused on one main fish area rather than a wide range of species. The trade-off is that it’s efficient, easy, and fun for mixed ages.

The Main Drawbacks to Consider Before You Book

Based on what you’ll want to feel confident about, these are the most common considerations:

• Crowding and downstairs comfort: the lower area can feel tight when the boat is full, and it may get warm.
• Audio clarity: commentary may be harder to hear depending on noise level.
• Visibility depends on conditions: if water is cloudy, you may spot fewer fish close to the windows.

None of these ruin the experience—they’re just the realities of a short, popular attraction. The upside is that even when it’s busy, the diver feeding keeps the energy high and the views still deliver.

Should You Book the Poseidon Submarine Cruise?

Book it if you want a short, high-reward Rhodes Town activity: harbor sights, Old Town views, and an underwater feeding highlight for about 45 minutes. The price point makes it easy to justify, especially if you’re traveling with kids or you’re trying to balance sightseeing with downtime.

Skip or adjust expectations if you’re chasing a longer underwater journey, or if your time choice is 18:30 and you were specifically hoping for the full diving show component. In that case, pick a different departure time or make peace with the fact that the underwater highlight is more about fish viewing than a full show.

If you want Rhodes Town from the water and below the surface without complicated logistics, this one is a practical win.

FAQ

How long is the Rhodes Town submarine cruise?

It lasts about 45 minutes total.

Where does the submarine cruise depart from?

It departs from Mandraki port, at Poseidon Submarine, opposite the Bank of Greece building.

What can I see during the cruise before the underwater part?

You’ll cruise past highlights around Rhodes Town, including Mandraki Harbour, the Palace of the Grand Master area, and the Old Town.

Is there an onboard guide?

There is live tour guidance in English, and you’ll also have an audio guide in English and German.

What is included in the underwater viewing?

You’ll watch underwater sea life through large panoramic windows, and a diver feeds fish in front of the viewing area.

Can I go outside during the trip?

Yes, you can leave the cabin and walk out onto the deck for sea breeze and views from the water.

Does the 18:30 departure include the diving show?

No. The 18:30 cruise doesn’t include a diving show.

Is the price all-inclusive?

The submarine cruise, audio guide, and access to a bar are included. Drinks and personal expenses are not included.

Is the experience wheelchair accessible?

Yes, it’s listed as wheelchair accessible.