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Private Cruises
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Sikia-cave
Tailor-Made Yacht Tours
A Private Boat Tour to Sikia Cave slips beneath its collapsed open roof aboard a luxury yacht. Dive into the emerald pool, continue along Milos' southern coast, with chef-prepared Mediterranean meals and an open bar always served on deck.
Starting from
950€
Semi-Private Cruises
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Sikia-cave
Small-Group Yacht Tours
A Semi-Private Boat Tour takes a small group on a shared cruise to Sikia Cave, along the hidden coves of southern Milos. Swim through the sunlit cave and snorkel volcanic arches, with chef-prepared Mediterranean meals and an open bar.
Starting from
170€
/ Person
Private Sea Transfers
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Cyclades
Sea Transfers & Multi-Island Tours
A Private Sea Transfer past Sikia Cave crosses between islands across the Cyclades aboard a premium yacht. Travel on flexible routes with comfortable seating and attentive crew, a smooth boat trip to Santorini, Mykonos, Ios, and more.
Starting from
1,200€
Multi-Island Cruises
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Cyclades
Full-Day Exploration Voyages
A Multi-Island Cruise passes Sikia Cave on its way across the Cyclades. This island-hopping boat trip reaches nearby islands over a full day at sea, with swim stops, chef-prepared Mediterranean meals, and an open bar to enjoy under the Aegean sun.
Starting from
3,900€
Sea Ray Open-Yacht
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2024
Boat Tour
A Private Boat Tour to Sikia Cave slips beneath its collapsed open roof aboard a luxury yacht. Dive into the emerald pool, continue along Milos' southern coast, with chef-prepared Mediterranean meals and an open bar always served on deck.
Starting from
950€
Ryck Open-Yacht
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2024
Boat Tour
A Private Boat Tour to Sikia Cave enters beneath its collapsed rock ceiling aboard the Ryck. Dip into the green pool, then follow the wild southern coast of Milos, with chef-prepared Mediterranean meals and an open bar served throughout.
Starting from
1,150€
Raptor Open-Yacht
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2025
Boat Tour
A Private Boat Tour to Sikia Cave passes below its roofless stone arch aboard the Raptor. Dive into the still emerald water, then explore Milos' rugged southern coast, with chef-prepared Mediterranean meals and an open bar served on deck.
Starting from
1,350€
Navygon Open-Yacht
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2026
Boat Tour
A Private Boat Tour to Sikia Cave drifts into its sunlit open cavern aboard the Navygon. Plunge into the clear emerald pool, then trace along Milos' southern coastline, with chef-prepared Mediterranean meals and an open bar all day.
Starting from
1,550€
Raptor Open-Yacht
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2025
Boat Tour
Join Navy Blue for a premium shared boat tour on the Raptor Open-Yacht. The cruise is shared, yet calm and spacious. Swim stops can feature Kleftiko and Sarakiniko, with Kimolos and Poliegos when conditions allow. Enjoy fresh Mediterranean bites, an open bar, and premium onboard amenities.
Starting from
1,350€
Navygon Open-Yacht
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2026
Boat Tour
Travel aboard our modern yachts to Santorini, Mykonos, Naxos, Paros, Ios, and more destinations across the Greek Islands. Enjoy fast, exclusive travel without the crowds or ferry delays, with stunning coastal scenery along the way.
Starting from
1,550€
Navygon Open-Yacht
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2026
Boat Tour
Discover multiple Greek Islands in one journey with our Multi-Island Cruises. Combine yacht travel with scenic stops across the Cyclades. Swim in coves, enjoy chef-prepared meals, and explore Santorini, Mykonos, or Paros in curated luxury.
Starting from
1,550€
What Makes Sikia Cave Special
Hidden along the southern coast of Milos, this roofless sea cave opens onto a sunlit emerald pool reachable only from the water
The Sunlit Sea Cave of Southern Milos
Sikia Cave is the only sea cave in Milos with a collapsed roof that opens directly to the sky, set along the island's southern coast in the Cyclades, where a boat tour brings you in through the sea arch. Sunlight pours through this natural skylight onto the water below, turning it a brilliant emerald green at midday. The cave takes its name from the old fig tree, Sykia in Greek, that still grows at the edge of the opening above.
The chamber was formed by volcanic activity and sea erosion, with steep mineral walls streaked in orange, red, and grey. Layered stone shifts in color throughout the day, from deep amber at sunrise to warm copper under the Aegean midday light. In earlier centuries, fishermen from Adamantas used this stretch of coastline as shelter during rough seas.
Far from roads or footpaths, Sikia remains untouched and is reachable only from the water. A Navy Blue Boat Tour glides through the sea arch and enters the sunlit chamber.
Four Ways to Visit Sikia Cave
Explore Sikia Cave's southern coastline with Private Charters, Shared Boat Tours, Sea Transfers, and Multi-Island Cruises
Private Cruises to Sikia Cave
Sikia Cave Private Experience
A Private Boat Tour brings you to Sikia Cave along southern Milos. As the luxury yacht rounds the cliffs near Gerontas, the sea arch of Sikia comes into view. Your crew guides the vessel into the sunlit chamber, where golden walls rise above clear water.
Swim beneath the open roof, explore the layered rock surfaces, or float in the calm emerald pool. Your captain adapts the route to your pace, with chef-prepared Mediterranean meals and an open bar on board, in full comfort and privacy throughout the day.
Semi-Private Cruises to Sikia Cave
Shared Luxury – Intimate Experience
A Semi-Private Boat Tour offers shared access to Sikia Cave and the volcanic bays of southern Milos. Cruise with a small group through calm waters toward the sea arch and into the sunlit cave. The atmosphere stays relaxed and welcoming, giving you space to swim, take photos, or rest on deck.
Each stop shows a different angle of the coastline, from the cliffs near Thiorichia to the mineral-streaked walls of Sikia. Mediterranean meal boxes are served on board, prepared with fresh local ingredients. With friendly crew guidance, this boat tour blends company with southern Milos.
Sea Transfers to Sikia Cave
Direct Transfers & Multi-Island Trips
A Direct Sea Transfer along the southern coast of Milos passes Sikia Cave and its volcanic arch. As the premium yacht follows the shoreline, guests catch a close view of the collapsed roof, the mineral walls, and the emerald pool inside the chamber, on the way to Santorini, Mykonos, and Ios.
A Multi-Island Transfer gives you the option to combine up to five islands in one journey before your final destination, with chef-prepared Mediterranean meals and a premium open bar on board. Explore islands like Santorini and Amorgos across the Cyclades and the wider Greek Islands.
Multi-Island Exploration Cruises
Island-Hopping Boat Trips in the Cyclades
A Multi-Island Cruise passes Sikia Cave on its way across the Cyclades, where golden volcanic walls and a sunlit open roof set the tone for the day. This island-hopping boat trip reaches Sifnos, Despotiko, Antiparos, and Paros over a full day at sea, before returning to Milos.
Navy Blue shapes five curated routes around the weather and your preferences. Every full-day trip includes chef-prepared Mediterranean meals, a premium open bar, snorkeling gear, and paddle boards. The day balances swim stops, sunlit decks, and relaxed open water cruising.
Navy Blue | Analytics & Metrics
Milestones from every season across Milos, Kimolos, Poliegos and the Cyclades
Satisfied Guests
10,400+
Cruises Performed
1,600+
Nautical Miles
45,000+
Supported Islands
25+
Top Destinations
Milos, Kimolos, Poliegos
Kleftiko, Milos
Sarakiniko, Milos
Rema, Kimolos
Blue Bay, Poliegos
Gerakas, Milos
Private Cruises
Semi-Private
Guests Nationality
Country of Origin
USA (43%)
Australia (14%)
Greece (6%)
Canada (5%)
UK (4%)
Other (28%)
Milos Weather
Summer Season | May ~ Oct
Sunny (87%)
Cloudy (9%)
Rainy (4%)
Sikia Cave Boat Tour FAQs
Everything you need to know about our boat tours to Sikia Cave in Milos
How Do You Reach Sikia Cave in Milos?
Sikia Cave is reachable only from the sea. The chamber sits on the remote southern coast of Milos, well away from roads and footpaths, and the one cliff trail is steep and dangerous. The safe and premium way to visit is by Private Cruise, Semi-Private Cruise, or Sea Transfer.
Navy Blue departures leave from Adamantas, Agia Kiriaki, or Pollonia and round the cliffs near Gerontas before reaching the Sikia sea arch. A Private Cruise reaches the cave in under an hour, with stops at Tsigrado, Gerakas, or Kleftiko along the way. A Semi-Private Cruise follows a similar South Cruise route with a small group on board. For travelers crossing between islands, a Sea Transfer along the southern coast also passes directly by the cave.
When Is the Ideal Time to Visit Sikia Cave?
Aim for midday, roughly 11:00 to 14:00, when the sun sits directly above the collapsed roof. Light pours through the natural skylight and turns the water inside the chamber a brilliant emerald green. Morning and late afternoon visits are still beautiful but carry more shadow and softer light.
Navy Blue Private Cruise schedules can be planned around this peak light window. A morning departure at 09:30 typically reaches Sikia around 11:00, catching the emerald color at its brightest. For photography, the overhead-sun window is also the time when the golden volcanic walls inside the cave show the strongest contrast against the water. Your captain will adapt the arrival time to conditions on the day.
Can You Swim Inside Sikia Cave?
Yes. The collapsed chamber opens onto a calm, sheltered pool ideal for swimming and snorkeling. The water inside sits slightly cooler than the open Aegean because direct sunlight only reaches it through the natural skylight above, so many guests find it refreshing after a warm day on deck.
Navy Blue cruises carry snorkeling gear, fins, and a freshwater deck shower on board, so swimming inside Sikia is a standard stop on any South Cruise. The seabed is rocky and home to small Aegean fish, which makes snorkeling worthwhile even though the visibility is shaded. Guests who want more time in the water can also swim from the cave into the nearby Kalogries Bay, where the water is warmer and the sandy bottom is ideal for relaxed floating.
What Is the Difference Between Sikia Cave and Sarakiniko?
Sarakiniko is a white volcanic landscape on the northern coast of Milos, reachable by road. Sikia Cave is an emerald sea cave on the southern coast, reachable only by boat. Sarakiniko suits walking and photography of lunar cliffs; Sikia suits swimming inside a sunlit sea chamber from a private luxury yacht.
Both are highlights of any Milos trip but they offer different experiences. Sarakiniko's bone-white tuff formations sit above the water and draw crowds of visitors arriving by car or scooter. Sikia Cave is quieter, more remote, and visited by a smaller number of travelers on Private Cruises, Semi-Private Cruises, or Sea Transfers each day. Guests who want to see both often pair a morning road trip to Sarakiniko with an afternoon boat tour to Sikia Cave for the full contrast.
What Can I Combine with a Sikia Cave Boat Tour?
Kleftiko is the natural pairing. The famous pirate sea caves sit about 10 minutes by luxury yacht from Sikia, and the two destinations together form a signature southern Milos route. Other nearby stops include Tsigrado, Gerakas, Kalogries Bay, and Firiplaka, each with its own swim or photography spot.
On a Private Cruise with Navy Blue, your captain can adapt the itinerary to include any of these stops based on your preferences and sea conditions. The South Cruise typically runs between Sikia Cave, Kleftiko, Tsigrado, and Gerakas when north winds prevail, and our half-day Private Cruises include four to five stops along the coast. For travelers wanting to cover more ground, a full-day Private Cruise extends the route to also take in Thiorichia or stop at Kalogries Bay for a leisurely lunch on board.
Explore More FAQs
Navy Blue Sikia Cave Boat Tour Reviews
Real guest experiences from our boat tours to Sikia Cave in Milos
Chris NY
22 May, 2025
Did a morning private cruise and Sikia was the first stop. Rounding the cliff and seeing that arch just stops you. The crew set up breakfast on deck while we swam. Worth every euro.
A. Jimenez
14 September, 2025
Sikia Cave was the stop that stuck with me. You come around the headland, the arch appears, and then you are floating under open sky inside a sea cave. Strange and beautiful.
Belgian Beauty
3 July, 2025
Family of four on a semi-private boat tour. Our kids loved the swim inside Sikia. The crew passed them snorkeling gear and showed them fish along the rock walls. A proper day out.
S. Mueller
21 July, 2025
Honeymoon cruise and Sikia was where we stayed the longest. Golden walls, calm water, no crowds. The champagne moment when we entered was a lovely touch from the captain.
D. Gilbert
8 July, 2025
Six of us on a semi-private and the crew took us through Sikia Cave around midday. The color inside was incredible. Floated in there with the sun right overhead, then snorkeled along the walls. The onboard food was properly good too.
Carol Sharp
17 April, 2025
Sikia Cave is the sort of place you cannot quite describe until you have been inside it. The way the light moves on the water, the silence when the engine cuts off, the color shift between the open roof and the shadow at the edges. Navy Blue's crew understood exactly what I wanted to capture.
Konstantinos Papadopoulos
1 August, 2025
I am Greek and I have been on many boats across the Cyclades. The private cruise to Sikia felt different. Attentive crew, great food, and inside the cave there was no one else. In August, that is a small miracle.
Claudio Luccini
5 September, 2025
Multi-island cruise starting at Sikia Cave. Continued to Kleftiko, crossed to Kimolos, finished at Poliegos. More in one day than most visitors see all week.
Eternal Love
3 June, 2025
Private cruise on the south route and Sikia was the highlight. Swimming inside the chamber, then a Mediterranean spread on deck. Open bar all afternoon. Would recommend to anyone visiting Milos.
Akita Sokomori
28 June, 2025
Came to Milos for photography and Sikia was top of my list. The sun was straight above the opening and the water turned emerald green. Every frame felt cinematic.
Stephanie
12 May, 2025
Booked a transfer to Santorini and asked if we could swing by Sikia on the way. Crew said yes and paused for a quick swim. Arrived calmer than any ferry would have left us.
Philipp Gosh
15 October, 2025
Late season, mid-October, and the weather held. Semi-private cruise nearly to ourselves. Sikia in autumn light is softer than summer but equally striking. One of the highlights of our Greece trip.
Chris NY
22 May, 2025
Did a morning private cruise and Sikia was the first stop. Rounding the cliff and seeing that arch just stops you. The crew set up breakfast on deck while we swam. Worth every euro.
A. Jimenez
14 September, 2025
Sikia Cave was the stop that stuck with me. You come around the headland, the arch appears, and then you are floating under open sky inside a sea cave. Strange and beautiful.
Belgian Beauty
3 July, 2025
Family of four on a semi-private boat tour. Our kids loved the swim inside Sikia. The crew passed them snorkeling gear and showed them fish along the rock walls. A proper day out.
S. Mueller
21 July, 2025
Honeymoon cruise and Sikia was where we stayed the longest. Golden walls, calm water, no crowds. The champagne moment when we entered was a lovely touch from the captain.
D. Gilbert
8 July, 2025
Six of us on a semi-private and the crew took us through Sikia Cave around midday. The color inside was incredible. Floated in there with the sun right overhead, then snorkeled along the walls. The onboard food was properly good too.
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