Rhodes Town: Submarine Cruise with Underwater Views

Rhodes looks different from the sea. This 45-minute cruise combines harbor views and Old Town history with a close look at fish through the vessel’s underwater windows. I like the easy central departure from Mandraki Harbor, and I like that the trip stays short enough to fit around a day of sightseeing. The main consideration is that the lower cabin can feel warm, crowded, or difficult to hear at busy times.

You are not boarding a true submarine that travels below the surface. The Poseidon remains above sea level, while its underwater viewing hull sits about 2.5 meters below the water. That is enough to give you a clear view of the seabed and feeding fish, but you should keep expectations realistic: this is a harbor cruise with a marine-life show, not an open-sea wildlife expedition.

Key points to know before booking

• Mandraki Harbor departure: The Poseidon leaves from Pl. Eleftherias, opposite the Bank of Greece, in the center of Rhodes Town.
• Two ways to enjoy the ride: Sit in the air-conditioned underwater cabin or head onto the deck for fresh air and views of Rhodes.
• The diver feeding show: A diver enters the water and feeds hundreds of colorful fish in front of the viewing windows.
• Short, useful timing: The 45-minute trip leaves plenty of time for the Old Town, the Palace of the Grand Master, or a beach visit.
• Best for families: Children get a clear, immediate wildlife experience without a long boat outing.
• Important evening note: The 18:30 departure does not include the underwater feeding show.

Starting at Mandraki Harbor

The meeting point is at Mandraki port, at Pl. Eleftherias 85100, opposite the Bank of Greece. This is a handy place to begin because Mandraki sits right beside central Rhodes Town, close to the Old Town and its harbor sights.

Look for the Poseidon Submarine boat rather than expecting a small, fully submerged craft. The vessel has an upper deck, onboard seating, a bar, and a lower viewing cabin. The ticket includes the cruise and an audio guide in English and German. A live guide is also listed in English.

The central location makes this a good choice if you have only a spare hour before dinner, a ferry, or an evening walk through the Old Town. You can also book ahead with the option to reserve now and pay later. Free cancellation is available up to 24 hours before departure, which helps if your port-day plans depend on weather or ship timing.

The boat is wheelchair accessible, though the most important practical point is to check how you want to spend the ride. If you prefer the underwater view, head down early for the best chance at a window seat. If fresh air matters more, stay on deck and use the cabin for the marine-life portion.

Ten minutes around Mandraki Harbor

The first part of the trip takes about 10 minutes around Mandraki Harbor. From the water, you get an angle on the harbor entrance, the town, and the waterfront that is easy to miss while walking.

Mandraki is also tied to one of Rhodes’ most famous stories: the Colossus of Rhodes is traditionally associated with this harbor entrance. The giant ancient statue no longer exists, and the Poseidon does not take you to a preserved monument. Still, the guide points out the area connected with the Colossus and gives you a useful sense of how ships approached Rhodes in earlier centuries.

This portion is scenic rather than extensive. You are not getting a full harbor tour with long stops at each sight. Instead, the boat keeps moving while the guide provides short historical comments. That works well for you if you want a quick introduction before exploring on foot.

The upper deck is the better place for wide views and photographs. The lower cabin gives you the underwater perspective, but windows and other passengers can make it less convenient for taking broad shots of the town. I would treat the deck as the main viewing place for Rhodes and the lower cabin as the main viewing place for the sea.

Ten minutes facing the Palace of the Grand Master

The boat continues toward the area near the Palace of the Grand Master of the Knights of Rhodes. The palace is one of the most recognizable sights in the medieval Old Town, with heavy stone walls and a fortress-like outline.

Seeing it from offshore gives you a better sense of the city’s defenses. From land, the Old Town walls can feel like a boundary you pass through. From the sea, they read as a solid defensive system protecting the settlement behind them.

The boat does not take you inside the palace, and this is not a substitute for an inland visit. If you care about the Knights of Rhodes, the palace, the Street of the Knights, and the Old Town museums deserve separate time. What the cruise does well is give you an orientation view before you walk those streets.

The audio commentary adds value here, though sound quality can vary. Some passengers have found the recording too quiet, and background music has sometimes made the explanations hard to hear. If the guide is speaking live, stay close enough to the sound source. On a crowded departure, the deck may be easier for seeing the sights, but not always better for hearing the commentary.

Five minutes along the Old Town walls

The Old Town segment is brief, about five minutes, but it gives you one of the most attractive views of Rhodes. The medieval walls, towers, and waterfront appear as one broad scene instead of a series of narrow streets.

This is a good moment to take photographs, especially if you want a picture that includes the fortifications and the sea. The view also helps you understand the layout of Rhodes Town. You can see how the protected old city relates to the modern harbor and the open waterfront.

Do not expect the boat to pause for a long photo session. The route is designed as a continuous cruise, so keep your camera ready before the boat reaches the best angle. You will get more from the ride if you see it as a moving viewpoint rather than a stop-and-visit tour.

Twenty minutes with fish below the surface

The underwater section is the reason most people choose this boat. The Poseidon’s viewing hull sits 2.5 meters below the surface, with large windows intended to give you a panoramic look at the Aegean water below.

The seabed, rocks, sea grass, and schools of fish can be seen through the glass. The most memorable moment is the feeding presentation, when a diver enters the water and brings fish close to the windows. This is a simple idea, but it works, especially for children who may not have the patience for a longer boat trip.

The show also creates good photo opportunities. The diver may interact with the people in the cabin, and past departures have included underwater photographs of passengers shared through the company’s Facebook page. That possibility is a pleasant extra, but it should not be treated as a guaranteed part of every trip.

The marine life is best understood as a close harbor view, not a survey of the whole Aegean ecosystem. You may see many fish, sometimes in large groups, but the habitat can be limited. The water can also turn cloudy, and the condition of the windows matters. Some departures have had very clear glass, while others have offered a less sharp view because of dirty windows or reduced visibility.

That is why the feeding show matters. It concentrates the fish near the viewing area and gives you something specific to watch even if the surrounding water is not perfectly clear. Without the feeding presentation, the underwater section may feel short for someone hoping to see many different species.

The 18:30 cruise does not include the diver show. If the underwater action is the main reason you are booking, choose another departure time and confirm the schedule before paying.

Cabin comfort, deck space, and crowding

The lower cabin is air-conditioned, which is welcome during a hot Rhodes afternoon. Yet air conditioning does not guarantee perfect comfort. On some departures, the cabin has felt warm and sticky, particularly when many people go downstairs at once.

Crowding is the other practical issue. Several people have found the lower deck cramped when the whole boat moved down for the fish presentation. Seat-saving can also make things awkward, especially for a parent with a child. Crew members have helped by asking people to make room, but arriving early remains the best way to improve your position.

I would use a simple strategy:

• Arrive early enough to board without rushing.
• If you want the underwater windows, go downstairs soon.
• If you want town views, claim a deck position and return below for the feeding show.
• Bring a camera, but expect reflections through the glass.
• Keep children close during the change between deck and cabin.

The bar onboard sells drinks, but drinks are not included in the ticket. Personal expenses are also separate. For a short outing, that is reasonable, though you may prefer to bring your sightseeing budget rather than buy refreshments on board.

How the audio guide affects the experience

The commentary covers Rhodes sights and local history, including the harbor, the palace, the old walls, and other views along the route. It adds useful context to what would otherwise be a simple harbor ride.

Sound is not always the strongest part of the trip. The recording has been too quiet on some departures, and music can compete with it. This matters more if you are booking mainly for history. If you are mainly interested in scenery and fish, weak commentary is less serious.

I would not choose this cruise as your main historical tour of Rhodes. The information is an added layer, not a detailed lesson. Its real strength is combining a quick introduction to the town with a visual marine-life presentation.

Is $23 good value?

At $23 per person, this is one of the easier Rhodes activities to justify. You get a 45-minute boat ride, views of Mandraki Harbor and the Old Town, access to an underwater viewing cabin, and the chance to watch a diver feed fish.

The price works especially well for families. A longer boat cruise can become tiring, costly, or boring for younger children. This trip gives them something to watch almost immediately and still leaves most of the day free. It also suits couples and solo visitors who want a different view of Rhodes without committing to a full-day excursion.

The value depends on your expectations. If you want pristine open-water conditions, rare marine animals, or a long underwater session, this will probably feel limited. If you want a cheerful, low-cost activity with scenery and a guaranteed point of interest, the price is strong.

The trip is also useful as a gap-filler. You can fit it between sightseeing stops, use it during the hottest part of the day, or book it before an evening meal. At 45 minutes, it does not take over your visit to Rhodes.

Who should book the Poseidon?

I would recommend this cruise most strongly to:

• Families with children who enjoy fish and simple visual attractions.
• First-time visitors who want a quick view of Rhodes from the water.
• Anyone with limited free time near Mandraki Harbor.
• Couples looking for a relaxed, inexpensive harbor activity.
• Visitors who like combining scenery with a small amount of local history.
• People who want a wheelchair-accessible boat activity, subject to their own mobility needs.

You may want to skip it if you dislike boats, crowded viewing areas, or short presentations. It is also a weaker choice for serious marine-life enthusiasts, since the underwater habitat may show mostly one type of fish and visibility can change.

What to expect from the crew

The crew is one of the most consistently praised parts of the experience. They help with boarding, keep the trip moving, and manage the cabin when too many people try to sit downstairs at once.

The underwater presenter is central to the fun. The diver’s fish-feeding routine gives the trip its theatrical moment and keeps children focused. On some outings, the diver has also interacted with passengers and helped create underwater photographs.

The overall tone is friendly and relaxed rather than formal. You are not signing up for a luxury yacht cruise. The boat can look a little basic, and the experience has a cheerful, family attraction feel. That is not a problem at this price, as long as you know you are paying for an enjoyable short outing rather than polished high-end service.

My practical advice for choosing your departure

Choose a daytime departure if the fish presentation is important. Avoid 18:30 because that sailing does not include the underwater feeding show.

For the clearest possible views, conditions matter. Water can be cloudy, and glass quality can vary. You cannot control that, but you can improve your experience by sitting close to the windows and keeping your lens away from direct contact with the glass to reduce reflections.

Plan your sightseeing around the boat’s central location. You can visit the Old Town before or after the cruise, then walk toward the palace or the harbor walls. The boat itself does not replace those visits, but it gives you a useful view of them from offshore.

Final verdict: book it for the fish, views, and price

I would book the Rhodes Submarine Cruise if you want a short family-friendly outing that adds something different to a day in Rhodes Town. The diver feeding fish is the main attraction, while the views of Mandraki Harbor, the Old Town walls, and the Palace of the Grand Master make the 45 minutes feel varied.

Book it with realistic expectations. The cabin may be crowded, the commentary may be hard to hear, and the underwater habitat is not enormous. Still, $23 buys a pleasant change of pace, a look beneath the surface, and some of the best harbor views in Rhodes without sacrificing half your day.

FAQ

Where does the Rhodes submarine cruise depart from?

It departs from Mandraki port at Pl. Eleftherias 85100, opposite the building of the Bank of Greece. The boat is the Poseidon Submarine.

How long is the cruise?

The cruise lasts 45 minutes. The route includes time around Mandraki Harbor, the Palace of the Grand Master, the Old Town, and an underwater marine-life viewing section.

Does the boat actually travel underwater?

No. The vessel remains above sea level. Its underwater viewing hull sits about 2.5 meters below the surface, allowing you to look through large windows.

Is the diver feeding show included on every departure?

No. The 18:30 cruise does not include a diving show. Choose another departure if watching the diver feed the fish is important to you.

What is included in the ticket?

The ticket includes the submarine cruise, an audio guide in English and German, and access to a bar onboard. Drinks and personal expenses are not included.

Is the cruise wheelchair accessible?

Yes, the activity is listed as wheelchair accessible. The booking information does not provide further details about specific boarding or cabin arrangements, so you may want to confirm those needs in advance.