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Board a glass-bottom boat from Fira and traverse Santorini’s volcanic caldera: hike to Nea Kameni’s steaming craters, swim in the warm springs of Palaia Kameni, and enjoy two hours on tranquil Thirassia. Practical for cruise passengers, this 5–6 hour loop combines geology, swims and island time.
Board a glass-bottom boat from Fira and traverse Santorini’s volcanic caldera: hike to Nea Kameni’s steaming craters, swim in the warm springs of Palaia Kameni, and enjoy two hours on tranquil Thirassia. Practical for cruise passengers, this 5–6 hour loop combines geology, swims and island time.
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Operated by Dakoutros Travel · Fira, South Aegean
You step down the narrow stairs of Fira’s old port and the Aegean air hits differently—salty, warm and carrying a faint sulfur tang from the volcanic islands ahead. The Calypso glass-bottom boat rocks gently as crew shout a welcome; below, shards of black lava and pale pumice glide past the viewing panes while the island chain of Santorini unrolls in layered cliffs and whitewashed villages.
easy.
5–6 hours.
Suitable for most travelers with basic mobility; requires a 20-minute uphill walk on volcanic rock and short swims.
The tour is about 5–6 hours (≈330 minutes) and departs from the Old Port of Fira; check local meeting instructions for exact meeting point.
Yes—the boat anchors a short distance from shore and lowers a ladder; you’ll swim roughly 20–30 meters to the shallower hot spring/mud area where water temperatures reach about 30–35°C mixed with sea water.
The trail to Nea Kameni’s crater takes about 20 minutes each way over uneven volcanic ground; it’s short but steep—good footwear and steady balance are recommended.
The vessel has an on-board restroom; infants and small children can use strollers to the meeting point, but the volcano walk and ladder water entry are not wheelchair-accessible.
Santorini’s caldera is the remnant of a massive Bronze Age eruption (around 1600 BCE) that reshaped the islands; Nea Kameni formed later through successive volcanic activity.
The caldera’s marine and volcanic environments are sensitive—avoid walking off marked paths, don’t disturb fumaroles, and minimize sunscreen and plastic in the water to protect reefs and wildlife.
Dakoutros Travel operates guided outdoor trips and adventures with an emphasis on safety, stewardship, and memorable experiences.
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