Kotor: Blue Cave Swim Stop, Lady of the Rocks & Submarine Base

The Blue Cave is the big prize. This three-hour speedboat trip packs several of Kotor Bay’s best sights into one outing, from the church island of Our Lady of the Rocks to Cold War submarine tunnels and a swim in brilliant blue water. I like the efficient route and the striking mountain views, especially if you have only one day in Kotor.

I also like the friendly crews, smooth boat handling, and choice of departure times. The main drawback is that the experience depends heavily on the sea. Rough water can cancel the Blue Cave stop, and the ride can feel windy, chilly, or crowded for some people.

Quick points before you book

• The Blue Cave swim is the highlight: Sunlight shining through the cave entrance gives the water its famous blue glow, but swimming time is brief and may be canceled in rough conditions.
• Our Lady of the Rocks costs extra: The island visit takes about 20 minutes, and entry to the church and museum costs €3.
• The speedboat covers a lot of ground: You cruise through Kotor Bay, past Perast and Mamula Island, through Verige Strait, and into Tivat Bay.
• The submarine tunnels are a short but unusual stop: Expect about five minutes at the former military site, with a quick explanation of its Cold War role.
• The meeting point can be confusing: Arrive at least 30 minutes early near Park Slobode, close to Kotor’s port.
• Come prepared for wind and water: Bring a jacket, sunscreen, hat, swimwear, towel, sandals, and water shoes if you plan to use the boat ladder.

Three hours through Kotor Bay

At $39.91 per person, this is a good-value way to see a large section of the bay without arranging separate transport or boat trips. Fuel, insurance, water, and an English-speaking skipper or guide are included. You pay only the €3 church and museum admission separately, plus any food or drinks you want during the outing.

The boat carries up to 25 people. That keeps the cost down, but it also means this is not a private cruise. You may have to share the best viewing spots, and some departures can feel full when everyone is sitting together.

The trip starts near Park Slobode, a short walk from Kotor’s port area. Finding the correct stand may take more effort than expected. The meeting instructions have been described as unclear, so I would not arrive at the last minute. Look for the operator’s stall in the park area after crossing the overpass from the port side, and allow extra time if you are driving because roadworks and traffic can slow the approach.

The crew generally keeps the boat moving on schedule. Some skippers give lively personal commentary, while others rely partly on recorded information. That variation matters if local stories are a major reason you are booking. The best outings seem to include a personable captain who points out the sights and adds humor, while the quieter trips focus more on scenery and transport.

Cruising below Kotor’s mountain walls

The first stretch is a scenic ride along the Bay of Kotor. The water is enclosed by steep mountains, old stone settlements, small fishing communities, church towers, and Mediterranean vegetation. From the boat, you get a broad view that is difficult to match from the road.

This opening ride is not just filler. It gives you a sense of why the bay has long mattered as a harbor and military route. You pass small coastal towns and see how homes, churches, and fortifications fit tightly between the mountains and water.

A speedboat also lets you see more in a short time. You can cover the bay’s main sights in roughly three hours rather than spending much of the day moving between separate stops. The tradeoff is that the boat ride can become windy, especially outside the warmest summer months. Bring a cardigan, light jacket, or shawl, even on a sunny day.

The boat may be covered, but wind still reaches you when the boat is underway. Sunglasses help with glare and spray, and a hat with a secure fit is more useful than a loose sunhat that can blow away.

Our Lady of the Rocks and its €3 church visit

Our Lady of the Rocks, or Gospa od Škrpjela, is a man-made island opposite the old town of Perast. Local seafarers built it over generations by placing rocks and sinking old boats at the site. The result is one of the bay’s most distinctive sights: a small island with a church rising directly from the water.

You have about 20 minutes here. That is enough to hear the island’s story, enter the church and museum, and look at the artworks, votive objects, and maritime keepsakes inside. The €3 admission is not included, so keep a few euros ready.

This stop has real local character. The church is not simply a pretty building for photographs. Its paintings, offerings, and handmade objects connect it to the seafaring life of the bay and to generations of local devotion.

The short stop is also the first place where the schedule can feel tight. If you want time to study every painting or browse carefully through the museum, 20 minutes will pass quickly. You also cannot swim or use a drone here.

Dress properly before entering the church. Swimwear alone is not allowed, so wear at least a T-shirt over your bathing suit. Comfortable sandals or shoes are useful because you are stepping from a moving boat onto a small island surface.

The boat usually passes Perast as part of the route. This elegant waterfront town grew during the Venetian era, when it was an important maritime center. Its stone streets, baroque buildings, and old churches are best appreciated from the water on a short tour like this, although the boat does not give you a full town visit.

The Blue Cave swim stop

The Blue Cave, or Plava Špilja, is the moment most people are waiting for. The cave can be reached only by boat, and sunlight reflected from the pale bottom gives the water a strong blue color. The effect changes with the daylight, so a late evening departure may not produce the same color seen earlier in the day.

The boat typically pauses for about 20 minutes. Depending on conditions, you may enter the cave by boat and have time for a short swim nearby or inside the cave area. The water is clear and refreshing, but this is not a beach stop with a long, relaxed swim.

You should understand the swimming setup before you book. In many cases, you jump from the boat or use a narrow ladder rather than walking into shallow water from a beach. Getting back aboard takes some balance, particularly when the sea is moving. The crew can help you, and life jackets are standard equipment on the boat, but you should ask for one if you want extra support.

Water shoes are a smart addition because the ladder steps are narrow. Bring your own towel, since towels are not listed among the inclusions. Put your phone and camera somewhere secure before entering the water.

The Blue Cave is also the least reliable part of the itinerary. Strong wind, large waves, or a storm can make the approach unsafe. In those conditions, the skipper may skip the cave or replace it with another stop, such as more time near Perast. That can be disappointing, but it is the right call for a small speedboat in open water.

If the Blue Cave is your main reason for booking, choose a departure in good daylight and avoid treating the swim as guaranteed. The water after 6 p.m. is not said to have the same blue appearance as it does earlier in the day.

Mamula Island and a grim coastal past

The boat passes Mamula Island, a small fortified island at the entrance to the bay. Built in the 19th century as a military fort, it later served as a prison during World War II.

You do not normally get a long island visit here. Instead, you see the fortress from the boat while the guide explains its military position and wartime use. The round stone walls and isolated setting make it an arresting sight, even from a distance.

This is a good example of the tour’s strength and weakness. You see several important places in one morning or afternoon, but some are viewed quickly. If you want to walk through Mamula or spend time on its shore, you need a different excursion.

Pay attention when the boat approaches. On less interactive departures, the guide may not clearly point out every landmark. Asking the skipper to identify Mamula and other sights can make the ride much more useful.

Five minutes inside the former submarine tunnels

The former submarine base is one of the tour’s most unusual stops. It lies beyond the narrow Verige Strait, where the route enters Tivat Bay. The tunnels were built as a secret military site and used during Montenegro’s Cold War period.

The boat cruises into the tunnel entrance, giving you a quick look at the dark opening cut into the shoreline. The stop lasts about five minutes, so think of it as a short historical glimpse rather than a full museum visit.

Still, the setting is memorable. A military tunnel hidden inside the coast feels very different from the churches and Venetian-era towns elsewhere in the bay. The contrast gives the tour more range than a standard sightseeing cruise.

The short timing can frustrate anyone hoping for a detailed explanation. The quality of the commentary depends on the skipper, and some departures may offer only a brief account. If you enjoy military history, consider reading a little about the site before boarding so you can better appreciate what you are seeing.

Boat comfort, crew style, and the ride itself

The crews receive strong praise for being friendly, helpful, and careful with boarding. Captains such as George and Aki have been singled out for humor, good timing, safe handling, and personal stories. Some crews provide jackets when the wind picks up, which is useful because the boat can feel much colder once it leaves the sheltered parts of the bay.

The ride is part of the entertainment. Music may play during the cruise, and some boats have Wi-Fi. Do not book specifically for Wi-Fi or a certain playlist, since these details can vary by boat and crew.

Most people will find the speedboat exciting, but it is not ideal for everyone. Boarding requires some agility, and getting off at Our Lady of the Rocks or climbing back aboard after swimming can be awkward. If you have limited mobility, ask the operator about the boarding arrangements before paying.

The boat is capped at 25 people, which is a modest group by excursion standards but not an intimate private trip. You may have a better view from the rear or sides, though seating is not guaranteed. If personal attention and quiet sightseeing matter most, a private boat would be more suitable.

What to bring and how to plan the day

Pack lightly, but bring the items that make a boat day comfortable:

• A light jacket or warm layer
• Sunglasses and sunscreen
• A hat that will not blow away
• Swimwear and a towel
• Sandals or comfortable shoes
• Water shoes for the narrow swimming ladder
• Drinking water and any snacks you want

Food and drinks are not included, so bring refreshments if you need more than the included water. The three-hour length is manageable without a full meal, but a drink is especially useful after swimming.

Arrive 30 minutes early. The tour begins close to Kotor’s port, but the exact stall can be easy to miss. If you are coming from a cruise ship, allow extra time for disembarkation. The operator has sometimes helped people move to a later departure when delays caused them to miss the original boat, but you should not rely on that.

The tour runs only in suitable weather. If conditions force a cancellation, you can receive a full refund or move to another date. If bad weather develops during the outing, the itinerary can change, and the Blue Cave may be removed for safety.

Is this Kotor boat tour worth $39.91?

For the price, I think it offers strong value if you want variety. You get a fast ride through much of the bay, an island church, a military tunnel, views of Perast and Mamula, and a possible swim in the Blue Cave. Booking separately for each experience would cost more and require more planning.

The value is lower if you expect long visits at every stop or a full guided history lesson. Our Lady of the Rocks lasts about 20 minutes, the submarine tunnel about five, and Mamula is mainly a pass-by sight. The tour is built around seeing a lot, not lingering.

The price also reflects weather risk. You are paying for access to the route and the boat experience, not a guarantee that every stop will be possible. If the sea is rough, the Blue Cave may be skipped. That is worth accepting before you book.

Who should book this experience?

I would recommend it to first-time visitors who have limited time in Kotor and want a broad look at the bay. It suits couples, families with older children, and anyone who enjoys scenery mixed with short cultural and military stops.

It is especially good for you if the following appeal:

• You want a quick overview of Kotor Bay
• You enjoy speedboat rides and open-water views
• You are happy with a short swim rather than a beach afternoon
• You like unusual places such as submarine tunnels
• You want several departure choices
• You prefer a group tour at a moderate price

I would hesitate if you dislike wind, motion, or boat boarding. I would also choose a slower private tour if you want long explanations, quiet photography, or plenty of time in Perast and at Our Lady of the Rocks.

Should you book it?

Yes, if you see it as a lively sightseeing cruise with a possible Blue Cave swim, not as a guaranteed beach day. The scenery is excellent, the route is efficient, and the combination of religious art, Venetian-era coastal towns, wartime fortifications, Cold War tunnels, and bright blue water gives you a memorable three hours.

Book early during busy periods, since the experience is often reserved well ahead of time. Pick a daylight departure, arrive early at Park Slobode, bring a jacket and towel, and keep your expectations flexible if the weather turns. With those small preparations, this is one of the better low-cost ways to sample Kotor Bay.

FAQ

How long does the Kotor Blue Cave boat tour last?

The tour lasts approximately three hours and ends back at the starting point near Kotor’s port.

What is included in the tour price?

The price includes the English-speaking skipper or guide, fuel, insurance, and water. Food and drinks are not included unless specifically stated.

How much does entry to Our Lady of the Rocks cost?

Entry to the church and museum costs €3 per person and is not included in the tour price.

Can I swim in the Blue Cave?

Swimming is offered when sea and weather conditions allow. The swim is short, and the Blue Cave stop may be skipped if waves or other conditions make it unsafe.

What should I wear to Our Lady of the Rocks?

You must wear at least a T-shirt inside the church. Swimwear alone is not permitted.

What happens if bad weather cancels the tour?

You can be offered another date or a full refund if the operator cancels because of poor weather. You can also cancel for a full refund up to 24 hours before the scheduled start time.