ÓRMOS ATHINIÓS BOAT TOUR FIELD GUIDE
Glass, Steam and Caldera: A Half-Day Circuit of Santorini’s Volcanic Heart
A 5 hour 45 minute boat tour from Órmos Athiniós or Fira that visits Nea Kameni’s volcanic craters, the thermal mud baths of Palaia Kameni, and offers leisure time on Thirassia with sweeping caldera views.
Glass, Steam and Caldera: A Half-Day Circuit of Santorini’s Volcanic Heart.
Adventure brief
Glass, Steam and Caldera: A Half-Day Circuit of Santorini’s Volcanic Heart
Departing from the port, the Tour of Caldera on the Calypso glass‑bottom boat threads Santorini’s volcanic isles: hike across Nea Kameni’s cratered slopes, swim to the naturally heated mud baths off Palaia Kameni, and spend time ashore on the quieter island of Thirassia while the vessel returns along the towering cliffs of the Caldera.
Santorini’s volcanic landscape is a spectacle of raw natural power, carved over centuries by fiery eruptions and shimmering blue waters. Dakoutros Bros J.V. offers a captivating journey through this dynamic island chain, starting from the port of Órmos Athiniós in the Cyclades. Their signature Caldera tour aboard the Calypso Glass-bottom Boat sets sail into a world where geology and beauty collide. Passengers glide past the active craters of Nea Kameni, where volcanic activity has created otherworldly formations and steaming vents—an active reminder of the island’s volatile past. Once on Palaia Kameni, visitors can enjoy a swim in rejuvenating hot springs warmed by the volcano beneath, experiencing a soothing mineral-rich soak while marveling at the shimmering waters around them. The tour includes downtime on Thirassia, a quieter island offering laid-back streets and vibrant local culture, perfect for wandering or sampling traditional Greek cuisine. Throughout the trip, panoramic vistas of Oia’s iconic cliffs, with their whitewashed houses and windmill silhouettes, provide stunning photo opportunities. Dakoutros Bros J.V. stands out in the Santorini adventure scene for their expert narration and comfortable vessel—making this tour both educational and accessible to a wide range of travelers. Whether you’re a geology enthusiast, a photographer, or simply seeking a day of immersive island scenery, this tour delivers an unforgettable taste of Santorini’s volcanic heart, all from the water’s vantage point. Their dedication to safety, environmental considerations, and authentic local experiences make them a trusted choice for those wanting to see the island’s fiery core while maintaining respect for its delicate environment.
Route Schematic
Route Schematic
Key stops on the Calypso glass‑bottom tour and what you’ll do or see at each.
Departure from the port
Embark from the Old Port of Fira or Athinios Port depending on the booked tour and set out across Santorini’s waters toward Nea Kameni.
Nea Kameni Volcano
Remain on Nea Kameni for about 1 hour and 15 minutes to hike and inspect the inactive craters and the active crater at the top, with panoramic views across Santorini’s Caldera.
Hot Springs (Palaia Kameni)
The boat anchors a few meters outside the small bay of Agios Nikolaos; passengers swim roughly 30 meters to the famous mud baths where the water temperature is about 20–25°C, with the vessel on site for roughly 30 minutes for swimming.
Thirassia
Two hours of free time to explore the island, swim in Korfos, dine at traditional taverns, and photograph the bay with views of Santorini.
Return to the port (sailing near the Caldera)
On the return leg the boat sails close to the volcanic cliffs of Oia and the Caldera and includes a stop at a reef intended for viewing through the vessel’s glass bottom before returning to port.
Routes and timing may be adjusted by the operator for weather or operational reasons; passengers with mobility concerns should note limited accessibility on board and ashore.
Highlights
Outing Highlights
Nea Kameni: Craters and Caldera Vistas
Explore Nea Kameni’s volcanic landscape and walk to viewpoints that look back across Santorini’s Caldera, taking in both inactive craters and the active crater at the top with a commanding view of the island’s geology.
Hot Springs: Warm Mineral Baths
Swim from the anchored boat to the mud baths at Palaia Kameni and relax in waters enriched with volcanic minerals and clay—a distinctive, naturally warmed experience offered on the route.
Thirassia: Two Hours of Free Time
The itinerary includes free time on Thirassia to explore the island, swim in Korfos bay, or eat at local taverns while photographing the bay with views back toward Santorini.
What the day feels like
What the day feels like
The trip unfolds as a measured loop: a short departure from port leads to Nea Kameni for a crater walk, then a controlled swim stop at the warm springs of Palaia Kameni, followed by a longer pause on Thirassia for independent exploration before the return passage that skirts Oia’s volcanic cliffs and the Caldera.
Suitability
Who it's for
Who this trip works best for—and who should look elsewhere.
Practical planner
Details to review before reserving
The full tour lasts approximately 5 hours and 45 minutes; departures begin from either the Old Port of Fira or Athinios Port depending on the booked tour.
Comfortable shoes for the volcanic hike, a swimsuit (preferably dark‑colored because hot‑spring water can stain), towel, hat, and sunscreen.
The tour is not wheelchair accessible; plan accordingly if anyone in your party has mobility limitations.
Review cancellation policies before reserving.
Frequently asked questions
Planning Your Outing
How long is the Tour of Caldera?
The tour lasts approximately 5 hours and 45 minutes.
Where does the tour depart from?
Departure is from either the Old Port of Fira or Athinios Port, depending on the booked tour.
Can I swim at the hot springs?
Yes; the boat anchors a short distance from the bay and passengers swim to the mud baths at Palaia Kameni for the scheduled swim stop.
How much time do we have on Thirassia?
The itinerary includes two hours of free time on Thirassia.
Is the tour wheelchair accessible?
No. The tour is not wheelchair accessible.
What should I bring for the trip?
Bring comfortable shoes for hiking, a swimsuit (dark‑colored recommended), a towel, hat, and sunscreen.
How this guide was prepared
This field guide is synthesized using verified supplier specifications, route descriptions, and destination data. Some booking links may generate affiliate revenue for ADV Guides.
- Verified: 2026-08-10T12:52:11.377Z
Some booking links may generate revenue for ADV Guides or The Adventure Collective.
Availability, pricing, schedules and operating details can change.
Trip details and contextual sources were reviewed by ADV Guides Editorial.