Diving in Finland

Finnish diving is cold-water, low-volume and club-organised, with a worldwide-rare wreck preservation regime that comes from low Baltic salinity blocking the Teredo navalis shipworm. Three operating modes carry the country: Baltic-coast wreck diving in summer, freshwater quarry and lake diving year-round, and a January-March ice-diving season. Two areas are indexed today, with Hanko and Utö sites sitting under their own area headings.

The Hanko peninsula is the country's primary wreck-diving area. The Baltacar project (2017-2019) installed mooring buoys and information signs at four sites in the Hauensuoli (Pike's Gut) strait, including Kaapelihylky, a Dutch single-masted vessel from around 1647-48 — the only buoyed multi-wreck route in Finnish waters. Hanko Diving runs the m/s Atlanta out of East Harbour, with Helsinki schools handling individual bookings. Russarö island around 5 km south is an active Finnish Defence Forces firing range that periodically closes a 20 km danger sector.

Saaristomeri (the Archipelago Sea) between mainland southwest Finland and Åland is Europe's largest archipelago by island count. It holds the most-storied Finnish wrecks (Vrouw Maria, Borstö 1, the Egelskär wreck), all closed to free recreational diving by Heritage Agency order. What divers actually reach are second-rank wrecks: Granvikin Hylky at 12-15 m, the Korpo-Norrskata cluster, and the open-Baltic Utö-Jurmo zone with S/S Park Victory at 27-36 m, the largest wreck in Finnish national waters. Diving is club-led, with no resident dive shops on the islands.

The Finnish Quarries area is the lessee-club freshwater regime built on decommissioned granite, limestone, asbestos and feldspar workings. It runs year-round in two modes: open-water in summer at 14-22 °C surface and 20-30 m visibility at the granite cluster, and under-ice in winter. Above the federation-listed training sites sits Ojamon kaivos in Lohja, with worked levels at 28, 58 and 88 m and around 1700 m of continuous line at 88 m. The Sukeltajaliitto magazine calls it Finland's only equivalent of Norway's Plurdalen.

Ice diving and Finnish Lakeland are country colour rather than catalogued areas. Lake Saimaa in the east is the only home of the critically endangered Saimaa ringed seal, a wildlife icon and not a recreational-dive subject. The country rewards drysuit-trained cold-water divers, technical and wreck specialists.

Finland runs a parallel federation and commercial-school system. The Sukeltajaliitto (Suomen Urheilusukeltajain Liitto), the CMAS-affiliated national federation with around 150 clubs, is the canonical home of Finnish diving culture, and its Sukeltaja-lehti magazine is the reference source. Commercial schools include Sukelluskoulu Aalto in Helsinki, Arctic Divers (PADI 5★ IDC, ice-dive specialism), Hanko Diving / Par Mare in Hanko, and Turun Sukelluskeskus on the SSI track. International cards (PADI, SSI, CMAS) are accepted. Emergency number is 112; the hyperbaric network runs through hospital-affiliated chambers, and operators maintain current contact lists.

Helsinki-Vantaa (HEL) is the international gateway. Hanko is 2-2.5 hours west by road, Lohja about one hour west, Turku two hours west. Turku (TKU) is the secondary airport for the Saaristomeri inner archipelago. The Pargas-Nagu-Korpo ferry chain reaches the inner-archipelago islands, and year-round Finferries from Pärnäs cross to Utö in roughly three hours, weather-dependent. Gear weight pushes most divers onto the road.

Four regulation layers apply. The Antiquities Act (Muinaismuistolaki, 295/1963) protects all wrecks 100 years or older as fixed underwater cultural monuments, criminalising touching, anchoring or artefact recovery. Specific Heritage Agency closures apply to Vrouw Maria, Borstö 1 and the Egelskär wreck. The Saaristomeri National Park is multi-zoned, with restriction zones (rajoitusosa) requiring Metsähallitus permission for landing or diving. Finnish Defence Forces firing and restricted areas, Russarö near Hanko most prominently, close access on firing days. The autonomous Åland Islands run a separate diving-licence regime through the Government of Åland. Practical season is mid-May to October on the Baltic, year-round at lessee quarries with member-club gating, and January-March under ice. Drysuit is standard. Currency is the euro; Finland is in the Schengen area.