Rhodes Town: Submarine Cruise with Underwater Views

The best part of this 45-minute cruise comes when the boat slows and a diver feeds hundreds of colorful fish beside the underwater windows. You sit in an air-conditioned cabin below the surface, then step upstairs for open-air views of Rhodes, so the trip gives you two quite different experiences in one short outing.

I like the easy central meeting point at Mandraki Harbour, and I like the price. At about $23 per person, this is a useful way to fill a spare hour without giving up a full morning or afternoon in Rhodes Old Town. The main consideration is that the underwater section is modest: you see one local marine area, not a large aquarium or a wide range of sea creatures.

Key points to know before booking

• The vessel stays above water: Only the underwater viewing hull sits below the surface, at about 2.5 meters.
• The diver feeding show is the main event: Fish gather right beside the cabin windows, making this the most memorable part for children.
• You get harbor and town views too: The route passes Mandraki Harbour, Elli Beach, the Old Town walls, and the former site of the Colossus.
• The trip is short and easy to fit in: The full cruise lasts 45 minutes, leaving plenty of time for sightseeing ashore.
• The lower cabin can feel crowded: Seats may be limited when everyone goes downstairs, and some visitors found the air warm or sticky.
• The 18:30 departure is different: That sailing does not include the diver feeding show.

What the Poseidon Submarine experience really is

The name may suggest a vessel traveling far below the sea. It is better to picture a sightseeing boat with an underwater observatory built into its hull. The boat itself remains above sea level, while the viewing cabin extends roughly 2.5 meters beneath the surface.

That distinction matters. You are not entering a submarine in the military sense, and you are not traveling through a submerged tunnel. You are sitting behind broad windows, watching the water pass at close range while the crew brings fish near the boat.

I see this as a gentle introduction to the sea rather than a serious marine expedition. The fish viewing area is limited, and the water can sometimes be cloudy. Still, the diver feeding the fish gives the short trip a clear focus, and the views of Rhodes from the water add more than you might expect for the fare.

Meeting Poseidon at Mandraki Harbour

The boat leaves from Poseidon Submarine at Mandraki port, opposite the Bank of Greece building at Pl. Eleftherias, 85100. This is a convenient spot in central Rhodes, close to the harbor sights and within easy reach of the Old Town.

I would allow time to find the exact boat before departure, especially if you are coming from the maze of the medieval center. The meeting point is not at a distant marina. You are right beside the main harbor area, where the town, sea wall, and historic sights come together.

The boat has a bar onboard, but drinks cost extra. Personal expenses are not included, so bring payment if you want something during the ride. The activity is wheelchair accessible, though the practical comfort of moving between the open deck and lower viewing cabin may depend on the layout and your needs. If accessibility is important for your party, confirm the arrangements when booking.

Ten minutes around Mandraki Harbour

The first part of the route takes about ten minutes around Mandraki Harbour. This is one of the most useful parts for getting your bearings in Rhodes Town because you see the harbor from the water rather than from the quayside.

The boat passes the area associated with the Colossus of Rhodes, the enormous ancient statue traditionally linked with the harbor entrance. The statue itself no longer exists, so do not expect a monument rising from the water. The value here is the setting and the chance to picture how the harbor functioned in the ancient city.

From the boat, the harbor gives you a broad view of Rhodes Town. You can also enjoy the breeze from the deck, which is a welcome break from the heat of the streets in summer. If you are traveling with children, this early stretch provides movement and scenery before the group gathers downstairs for the fish viewing.

Ten minutes of coastal views near the Palace

The next ten minutes offer views toward the Palace of the Grand Master of the Knights of Rhodes and the medieval fortifications. You do not enter the palace on this activity. Instead, you see the historic center from the sea, with its walls and waterfront profile giving you a different sense of the city.

I especially like this angle for visitors who plan to walk through the Old Town later. From land, the walls can feel massive and close. From the water, you see how strongly the fortifications define the edge of the historic city.

An English guide provides live commentary, and an audio guide is listed in English and German. The quality of the commentary can vary with the sound system. Some people found the recording too quiet, while others had trouble hearing when music was playing. I would treat the commentary as a useful extra, not the main reason to book.

Five minutes past the Old Town walls

The boat spends another five minutes near Rhodes Old Town. This is a brief passage, but it adds a good visual link between the harbor and the historic district.

You may see the walls, the waterfront, and the outline of the medieval city from a position that is impossible to reach on foot. The route also includes views toward Elli Beach and the Tourist Harbor. These are not long stops, so keep your camera ready rather than waiting for the boat to pause at every sight.

The cruise works best when you see it as a moving viewpoint. It is not a substitute for visiting the Palace of the Grand Master or walking the Street of the Knights. It is a compact way to understand how those sights relate to the sea.

Twenty minutes beside the underwater windows

The final 20 minutes focus on marine life and the diver feeding the fish. This is the section children usually anticipate, and it is also the part that gives the cruise its unusual character.

You descend into the air-conditioned cabin and look through large windows at the seabed, rocks, sea grass, and fish. The underwater hull is shallow, so you are not looking into a dark offshore world. Instead, you watch a local harbor-side habitat at close range.

When the diver enters the water, fish gather around him as he feeds them. The show is simple but effective. The action takes place directly in front of the windows, which makes it much easier for children to follow than wildlife viewed at a distance.

You may see large groups of fish, but do not book this expecting sharks, whales, or many different habitats. One of the practical limitations is that the underwater area can mainly feature the same kind of fish. Water clarity also changes, and dirty windows or cloudy water can make the view less sharp.

I would keep your expectations realistic: this is a brief fish-feeding demonstration in the Aegean, not a scientific tour. Within that limit, it is entertaining and gives you a view of the seabed that you cannot get from the deck.

The cabin, deck, and crowding question

The lower cabin is air-conditioned, which helps on hot Rhodes days. It is also where you get the closest look at the marine life, so most people will want to spend at least part of the trip below.

The cabin can become crowded when everyone heads downstairs at once. Some passengers found it difficult to find seats, particularly when people held several places. Crew members have helped organize seating, but you should still expect a compact arrangement rather than a spacious lounge.

A few people found the lower level warm or sticky after five to ten minutes. This is worth noting if you dislike enclosed spaces. You can return to the deck for fresh air and views, then go back down when the diver appears.

If you want the best chance of sitting downstairs, arrive with enough time to board comfortably and move into the cabin early. Do not sacrifice the deck entirely, though. The sea breeze and full view of Rhodes are half the appeal.

Is $23 a fair price?

At $23, I consider this good value for a short harbor activity. You receive a 45-minute boat ride, views of several major Rhodes sights, access to the underwater observatory, the fish-feeding show, an English guide, audio commentary, and use of the onboard bar area.

The trip is particularly useful when you have a gap in your schedule. It is long enough to feel like a proper outing but short enough to fit before lunch, after a museum visit, or between time at the harbor and a walk through the Old Town.

The value drops if you expect a long open-water cruise or varied marine wildlife. The underwater section is brief, and the boat usually remains close to Rhodes Town. For an inexpensive family activity with a memorable visual moment, the price works well. For serious snorkeling or sea life viewing, you would need a different kind of excursion.

Who will enjoy this cruise most?

I would recommend it first to families with children. The diver, moving fish, underwater windows, and changing views give younger passengers several things to watch. The 45-minute length also suits a ten-year-old who may lose patience on a longer boat trip.

It works well for couples and solo visitors too, especially if you want a calm view of Rhodes without committing to a full-day cruise. The harbor scenery makes it more than a children’s attraction, and the short format is handy when you have limited time.

Nature lovers should enjoy the close look at fish and the seabed, but you should not expect a full survey of Aegean wildlife. The activity is also a good choice for visitors who want to avoid swimming or snorkeling while still seeing something below the surface.

The cruise may be less suitable if you need lots of personal space, dislike warm enclosed cabins, or want extensive historical commentary. The audio can be hard to hear, and the sightseeing portions move by quickly.

Timing, sound, and small practical tips

The cruise lasts 45 minutes, with roughly ten minutes around Mandraki Harbour, ten minutes near the Palace of the Grand Master, five minutes by the Old Town, and 20 minutes for marine life viewing and the diver show.

Choose a departure time carefully. The 18:30 cruise does not include the diving show, so select another time if the fish feeding is your main reason for booking. Availability and starting times can change, so check the schedule before you reserve.

Bring your camera, but keep it ready before the diver enters the water. The feeding action happens right outside the windows, and the best moments can pass quickly. You can also photograph Rhodes from the deck, including the harbor and Old Town walls.

The trip includes free cancellation up to 24 hours before departure and allows you to reserve now and pay later. That flexibility helps if your Rhodes plans depend on weather or port timing. Drinks and personal purchases are extra.

My verdict: book it for the fish and the town views

I would book the Poseidon Submarine cruise if you want an inexpensive, family-friendly activity that adds something different to a day in Rhodes. The strongest reasons are the diver feeding fish beside the windows and the chance to see Mandraki Harbour, Elli Beach, the Old Town walls, and the former Colossus site from the sea.

I would not book it expecting a long underwater journey, perfect visibility, or a wide variety of sea creatures. The cabin can be tight, commentary may be difficult to hear, and the marine viewing focuses on a small area.

For $23 and 45 minutes, the limits are fair. Pick a departure before 18:30, arrive ready to choose between the cabin and deck, and keep your expectations simple. If you have children or a spare hour in central Rhodes, this is an easy activity to justify.

FAQ

How long does the Rhodes submarine cruise last?

The cruise lasts 45 minutes.

How much does the activity cost?

The listed price is $23 per person.

Where does the cruise depart?

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

What sights can I see from the boat?

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

Does the boat go completely underwater?

No. The vessel remains above sea level. Its underwater viewing hull sits about 2.5 meters below the surface.

Is the diver feeding show included on every departure?

No. The 18:30 cruise does not include a diving show.

Are drinks included?

No. The boat has a bar onboard, but drinks and personal expenses are not included.

What languages are available?

A live English guide is provided. Audio guidance is listed in English and German.

Can I cancel or pay later?

You can cancel up to 24 hours in advance for a full refund. Reserve now and pay later is also available.