Nisyros

Diving in Nisyros offers a unique glimpse into the Aegean's volcanic heart. The island's geology creates a dramatic underwater landscape characterized by black sand seabeds, impressive rock formations, sheer walls, and even areas with bubbling hydrothermal vents. This geothermal activity, a direct result of the active volcano, sets Nisyros apart from other Greek destinations, providing a truly distinct underwater environment. Divers can explore a world shaped by ancient lava flows, discovering caves, swim-throughs, and topography that is both stark and beautiful, teeming with life that has adapted to these special conditions.

With clear waters offering visibility often exceeding 20 meters, conditions are typically excellent from late spring to early autumn. The relatively small number of dive sites ensures they remain pristine and uncrowded. Nisyros is an ideal choice for divers seeking an off-the-beaten-path experience, combining exhilarating dives with the serene charm of a traditional Greek island. It's a destination that appeals to all levels, from beginners enjoying the calm bays to experienced divers exploring the deeper, more complex volcanic structures, making it a compelling addition to any dive log.

Top Sites

Frequently Asked Questions

What's the most popular dive site in Nisyros, Greece?
The most popular site is often called "The Bubbles." Located near the main caldera, this site is famous for the streams of geothermal bubbles rising from the seabed, a direct sign of the island's volcanic activity. Divers are drawn to the unique sensation of swimming through these warm, effervescent curtains. The surrounding reef features vibrant life that thrives in this unique environment, making it a memorable and iconic Nisyros dive.
What are the good and less popular dive sites in Nisyros, Greece?
Good, well-known sites include dramatic wall dives off the nearby islet of Gyali, featuring impressive drop-offs and large rock formations. For a hidden gem, seek out the shallower reefs around Avlaki. These less-visited spots are perfect for macro photography, hiding octopus, nudibranchs, and schools of smaller fish amongst the posidonia seagrass meadows. They offer a peaceful alternative to the more dramatic volcanic sites.
What water temperature is it like throughout the year diving in Nisyros, Greece?
Water temperatures in Nisyros, Greece vary seasonally. In winter (Dec-Feb), it drops to 15-17°C (59-63°F). Spring (Mar-May) sees temperatures rise from 17°C to 21°C (63-70°F). During the peak summer months (Jun-Aug), the water is warmest, ranging from 24-27°C (75-81°F). Autumn (Sep-Nov) cools gradually from 25°C down to 19°C (77-66°F).
When is the best time to visit Nisyros, Greece?
The best time for diving in Nisyros, Greece is from June to September. During these months, you'll experience the warmest water temperatures, excellent visibility, and calm seas. For those wishing to avoid peak season crowds, May and October offer a great alternative with slightly cooler water but still fantastic diving conditions and pleasant surface weather.
What's the visibility like during the dive season in Nisyros, Greece?
Underwater visibility in Nisyros, Greece is generally excellent. During the main dive season from May to October, you can consistently expect visibility of 20 to 30 meters (65-100 feet), and it can often exceed this on calm, clear days. Winter months may see a slight reduction due to weather, but conditions typically remain very good for diving.
Are there any seasonal migrations or special events (e.g., manta rays, whale sharks) in Nisyros, Greece?
Large seasonal migrations like whale sharks or mantas are not a feature of diving in Nisyros, Greece. The marine highlights are the resident Mediterranean species and the unique volcanic environment. However, you may have a lucky encounter with a pod of dolphins or a rare Mediterranean monk seal passing through the area. The summer months are a period of high activity for local fish species.
What marine life can I expect to see in Nisyros, Greece?
Expect a rich variety of Mediterranean life in Nisyros, Greece. Common sightings include groupers, moray eels, octopus, cuttlefish, and schools of barracuda and amberjack. The reefs are home to colourful wrasse, damselfish, bream, and scorpionfish. Macro lovers will find nudibranchs, shrimps, and crabs. The unique volcanic topography also supports a diverse range of sponges and algae.
What thickness wetsuit should I wear in Nisyros, Greece?
For peak summer (July-August) in Nisyros, Greece, a 3mm to 5mm full wetsuit is comfortable. During the shoulder seasons (May-June and Sept-Oct), a 5mm wetsuit is recommended. If you plan to dive in the winter or early spring, a 7mm wetsuit or a semi-dry suit is necessary to stay warm in the colder water temperatures.
How do I get to Nisyros, Greece?
Nisyros, Greece does not have an airport. The most common way to arrive is by flying into Kos Island International Airport (KGS). From the port of Kos Town or Kardamena, you can take a regular ferry to Nisyros, which takes approximately one to two hours. Ferries also connect Nisyros with Rhodes and other Dodecanese islands.
Should I book a liveaboard or stay on shore in Nisyros, Greece?
Nisyros, Greece is best experienced with a shore-based stay as there are no dedicated liveaboards. All diving is conducted via daily boat trips from local dive centers. This approach allows you to explore the island's unique terrestrial attractions, such as the volcano's crater and traditional villages, in addition to your underwater adventures. It offers a perfect blend of diving and cultural immersion.
All Dive Sites in Nisyros (9)
Pachia Ammos BuldersPachia ReefPali CornerShrimp CaveStingray ChampagneStrongyli IslandThe Volcanic FaultThe WellVolcano Bubbles