Rhodes Town: Submarine Cruise with Underwater Views

The best part of this Rhodes boat trip happens when the underwater observatory settles below the surface and a diver appears outside the windows with food. Fish gather close to the glass, giving you a clear, close-up look at life in the harbor without needing a mask or swimming skills.

I like the mix of Rhodes town views from the water and the short, good-value format. You get a little local history, a breezy ride, and a simple marine-life show for $23. The main drawback is space: the lower cabin can feel hot or crowded, and the underwater habitat may be limited to one area and a few types of fish.

Key points to know before you book

• The boat never fully submerges: The vessel stays above sea level while the viewing cabin sits 2.5 meters underwater.
• The diver-feeding show is the main event: Hundreds of colorful fish may gather beside the windows as the diver feeds them.
• You see Rhodes landmarks from a fresh angle: The route includes Mandraki Harbor, Elli Beach, the Old Town walls, the Tourist Harbor, and the site linked with the Colossus.
• The trip lasts 45 minutes: That makes it easy to fit around a morning of sightseeing or an evening meal.
• The lower cabin can be crowded: Go early if sitting downstairs matters to you, especially when traveling with children.
• The 18:30 departure has no diving show: Choose another sailing if the underwater feeding display is your main reason for booking.

What the Poseidon Submarine experience is really like

This is not a submarine expedition into the open sea. Think of it as a sightseeing boat with an enclosed viewing cabin below the waterline. The hull remains on the surface, while the cabin drops only 2.5 meters below the water, allowing you to look through large windows at the seabed and fish.

That distinction matters. You are not entering a dark underwater vessel or traveling far from Rhodes. You are taking a short harbor cruise with two pleasures built in: views of the town from the sea and a close look at marine life.

The boat leaves from Mandraki Port, opposite the Bank of Greece building at Pl. Eleftherias. This central location is useful if you are already exploring Rhodes Town, the Old Town, or the harbor. You do not need to set aside half a day. The full trip takes 45 minutes, including the cruise, sightseeing, and underwater presentation.

The staff provide live guidance in English, and audio commentary is offered in English and German. The commentary covers Rhodes sights and local history, though you may find it hard to hear at times. Several people have found the recording too quiet, especially when music is playing, so treat the narration as a bonus rather than the main reason to book.

Leaving Mandraki Harbor and seeing Rhodes from the sea

The first part of the trip is a slow cruise around the harbor. This gives you time to settle in and choose between the two main viewpoints.

Downstairs, the air-conditioned cabin has large windows for underwater viewing. Upstairs, the deck gives you open-air views, sea breeze, and a better angle on the harbor buildings. You can move between the two areas, although the lower cabin may fill quickly.

Mandraki Harbor is one of the most recognizable parts of Rhodes Town. The harbor is linked with the famous story of the Colossus of Rhodes, the enormous ancient statue traditionally said to have stood near the entrance. The statue itself is gone, so do not expect to see ruins of it in the water. The value is in seeing the setting and understanding how the harbor fits into the story of the city.

The route also brings the Palace of the Grand Master and the Old Town walls into view from offshore. From land, these fortifications can feel massive and enclosed. From the water, you get a wider sense of their position beside the harbor and coastline.

You may also see Elli Beach, the Tourist Harbor, and the windmill area mentioned during the sightseeing portion. These views are not a replacement for visiting the Old Town on foot, but they make a pleasant introduction. If you are planning to explore Rhodes later that day, the cruise helps you get your bearings quickly.

I especially like this section for first-time visitors. You are not simply looking down through glass for 45 minutes. You are also seeing the city as a port, which is a useful reminder that Rhodes has always faced outward toward the sea.

The underwater cabin and its large viewing windows

When the boat reaches the viewing area, you can sit in the air-conditioned cabin and look through the large windows. The windows are designed to give a broad view around the vessel, described as a 360-degree panorama.

The view depends heavily on water clarity and the condition of the glass. On a good day, you might see the seabed, rocks, grass, and schools of fish. On a less clear day, the water can look cloudy, and dirty windows may reduce the effect. This is one of the areas where expectations matter most.

You should not book this expecting a full survey of Aegean marine life. The underwater portion takes place in one habitat, and you may see the same kinds of fish gathering in one spot. There are no promises of large animals or a long list of species.

Still, the attraction works well because the experience is immediate. Children can see fish close to the windows without having to wait for a rare sighting. Adults get a simple view of the seabed and a different way to look at the harbor.

The cabin is air-conditioned, but that does not mean it will always feel comfortable. During busy summer departures, the lower level can become cramped and warm. Some people have been comfortable staying below for the whole presentation, while others have preferred to spend only five or ten minutes there before returning to the deck.

The diver-feeding show beside the boat

The diver is the main reason to choose this cruise instead of a standard harbor sightseeing ride. At the viewing area, the diver enters the water and feeds the fish directly outside the windows. The fish gather around the diver, creating the most memorable part of the trip.

This is a staged feeding display rather than a wild encounter, and it is best understood that way. You are being shown marine life in a controlled, easy-to-see setting. The benefit is that you get a much better chance of seeing fish than you would by simply cruising past the harbor.

The display is particularly effective for families. Children can follow the diver’s movements, watch the fish crowd around the food, and take photographs through the glass. The crew may also take photos or video from underwater, and past departures have included images shared through the company’s Facebook page.

Bring your camera, but be realistic about the conditions. Reflections, cloudy water, and moving fish can make photographs tricky. You will usually get better images by holding your phone close to the glass and avoiding flash.

The 18:30 cruise does not include the diving show, so check the departure time carefully. If the diver-feeding presentation is your priority, choose an earlier sailing.

How the 45-minute itinerary breaks down

The timing is short and fairly well balanced:

• About 10 minutes are spent cruising around Mandraki Harbor.
• Another 10 minutes are used for views toward the Palace of the Grand Master and the waterfront.
• Around 5 minutes focus on the Old Town and its walls.
• The final 20 minutes are devoted to marine life, the underwater windows, and the diver-feeding show.

The exact rhythm may vary, but this gives you a good idea of the experience. The cruise does not linger at every landmark. You get passing views, a little commentary, and time on the water before the main underwater presentation.

That pace is one of the strongest features. If you are traveling with a child who loses interest on long boat rides, 45 minutes is manageable. It also works well when your day already includes the Old Town, archaeological sites, beaches, or a meal near the harbor.

For adults, the short length keeps the experience from becoming repetitive. The route does not offer enough time for a detailed harbor tour or a serious nature study, but it does offer a pleasant sample of both.

Comfort, seating, and the best place to sit

If you want a downstairs seat, arrive with enough time to board before the cabin fills. A busy departure can leave the lower area crowded, especially when people hold several seats or move down at once for the underwater show.

The crew has helped reorganize seating when space became tight, but you should still expect a popular summer departure to feel busy. Families with young children may want to board early so they can sit together.

The deck is the better choice if you prefer fresh air and open views. It also gives you a break from the warmer lower cabin. You can then go downstairs when the fish presentation begins.

The boat has a bar onboard, but drinks are not included. Personal expenses are also extra. Wheelchair access is listed as available, though the most useful practical detail is to confirm with the operator if you need specific assistance getting between deck levels or into the viewing cabin.

Is $23 a fair price?

At $23 per person, this is good value if you want a compact activity rather than a major full-day excursion. The price covers the boat ride, the underwater viewing area, the diver presentation, and audio information about Rhodes.

You are paying for a simple harbor attraction, not a luxury cruise or a specialist marine tour. The boat may look basic, and the underwater habitat is limited. The commentary can also be difficult to hear, and the glass may not always be perfectly clear.

But the price works because the trip combines several small experiences. You get a view of Rhodes from the water, a short history introduction, open-air deck time, and a fish-feeding show. Comparable sightseeing activities can easily take longer and cost more, while this one leaves most of your day free.

I would consider it especially good value for families. Children get an easy-to-understand activity, and adults get photographs of Rhodes from a viewpoint they will not have while walking the Old Town streets.

Who should book this Rhodes cruise?

I would recommend it to families, couples, first-time visitors, and anyone with a spare hour near Mandraki Harbor. It is also useful for cruise passengers or day visitors who want a quick activity without traveling across the island.

Nature lovers should keep their expectations modest. You will see fish, rocks, grass, and the diver, but this is not a broad survey of Aegean wildlife. The setting is close to the port, and the same habitat may provide most of the underwater action.

It is a good choice for children because the fish are brought close to the windows and the trip moves along quickly. Teenagers may also enjoy the diver show and the chance to take photos. If you dislike crowds or feel uncomfortable in warm enclosed spaces, choose a quieter departure and plan to spend more time on deck.

Book with weather and visibility in mind. The town views remain worthwhile in ordinary conditions, but the underwater section is strongest when the water and windows are clear.

Should you book the Poseidon Submarine?

Book it if you want a short, affordable Rhodes activity with a clear visual payoff. The combination of harbor views, Old Town scenery, and a diver feeding fish makes this more interesting than a basic boat ride.

Skip it if you want a long open-sea cruise, detailed historical guiding, or a wide range of marine species. For most people with 45 minutes to spare near Mandraki Harbor, though, the $23 price is sensible, the schedule is easy to fit into a sightseeing day, and the underwater show gives the trip a memorable finish.

FAQ

Where does the Poseidon Submarine cruise depart?

It departs from Mandraki Port at Pl. Eleftherias, opposite the Bank of Greece building.

How long does the cruise last?

The cruise lasts 45 minutes.

How much does the experience cost?

The listed price is $23 per person.

Does the vessel fully submerge?

No. The vessel remains above sea level, while the underwater viewing cabin sits 2.5 meters below the surface.

Will I see a diver feeding fish?

Yes, the cruise includes a diver-feeding show on most departures. The 18:30 cruise does not include the show.

Which Rhodes sights can I see?

The route includes Mandraki Harbor, the area associated with the Colossus of Rhodes, Elli Beach, the Tourist Harbor, the Palace of the Grand Master, and the walls of the Old Town.

Is commentary included?

Yes. Audio commentary is available in English and German, and live guiding is provided in English.

Is the cruise wheelchair accessible?

The activity is listed as wheelchair accessible. If you need specific assistance with boarding or moving around the boat, confirm the arrangements with Poseidon Submarine before departure.