Aland Archipelago

Visit Aland says its diving season usually starts in late March or early April, subject to ice, and runs toward mid-December. For a comfortable mixed holiday, June to August is the easiest broad choice. For wreck specialists, May to June and September to October may avoid part of the midsummer algal peak, though autumn brings colder water and more weather risk. No month guarantees visibility, a boat departure or access to a particular protected wreck. Reserve a guide first, request the current permit and confirm exact conditions immediately before diving.

Yes. Aland's Maritime Cultural Heritage Act requires government permission for diving with equipment that supplies breathing gas, subject to specific statutory exceptions. The tourism board recommends booking a professional guide to handle the applicable permits. Do not assume that a valid Open Water certification, a private boat or a wreck name on a website is enough. The act also addresses dive notifications and reporting by permit holders. Ask a current local operator which permit covers your named dives and confirm that it is valid for the date, site, group and intended depth.

The local Divealand wreck guide lists Nederland, Sanny, S/S Skiftet and other wrecks in a broad 0 to 35 m recreational category. The Baltic Sea portal puts Nederland at roughly 20 m to 24 m and Plus at 25 m to 37 m. A list category is not your personal depth clearance: some sections can be too deep for basic certification. Permit limits, currents, cold water, visibility and the guide's requirements can change the actual choice. Request a specific dive profile before committing.

No. Divealand states that penetration and retrieving or moving objects are prohibited on the wrecks it describes. The Aland maritime-heritage law also protects older underwater remains against unauthorized disturbance. Stay outside wreck structures, maintain buoyancy clear of fragile timber or ironwork, do not anchor on an archaeological feature and do not take souvenirs. Some wrecks have stricter prohibitions, including the Champagne galeas and Soviet submarine S-2. A wreck photographed or described in a public archive is not evidence that it is open for recreational tourism.

No current multi-night dive-liveaboard product serving the approved Aland wreck-diving visitor region was independently verified. Divealand describes weather-planned outings and, when possible, two dives in a day. Its boat has two bunks, but that is not proof of overnight charter packages. Baltic passenger ferries with cabins are transport, not dive liveaboards. Plan a land-based stay with local dive outings: sleep in Mariehamn or another land base and go out by boat with a permitted guide. If a provider offers a new expedition, independently confirm its route and legal permissions before changing classification.

A current Aland-based freediving school, supervised depth line, dedicated charter or course timetable was not verified during this research. The well-documented local operator offering is scuba wreck diving, which should not be marketed as a freedive tour. A capable visitor may consider short, lawful, sheltered breath-hold swimming with a trained buddy during summer, after checking water quality and local access restrictions. The breathing-gas scuba law should not be casually extended to surface swimming, but any plan to approach a protected wreck or conduct organized depth training warrants direct local authority guidance. Never train alone.

The tourism board identifies Lilla Holmen and Nabben in or near Mariehamn, and Degersand in Eckero, as swimming beaches. These make useful places to investigate for calm, shallow mask-and-snorkel water time, but none was verified as a guided snorkeling site with rental equipment or a coral reef. The Baltic Sea snorkeling guide describes interest in underwater plants and rocks rather than tropical wildlife. Check local beach rules, shore entries, weather and cyanobacterial warnings. Choose a safe shallow area away from traffic, take a buddy and stay ashore if the water looks suspicious.

Expect cold conditions even when the surface feels pleasant in summer. The Baltic Sea public guide notes that deeper wreck water can remain around 4°C. Temperature layers can produce abrupt cooling after descent. Visibility is not a single reliable destination number: spring blooms, summer cyanobacteria, wind-stirred sediment and bottom clay can all impair sight, while later autumn may sometimes clear. No specific current wreck-level visibility reading was independently established. Pack a properly managed cold-water setup, redundant lighting as appropriate and a conservative dive plan rather than relying on seasonal averages.

The most convenient planning base is Mariehamn, where Divealand lists its center. Mariehamn Airport, code MHQ, has regional flight connections that should be checked against the airline timetable. Ferries serve the islands from Swedish and Finnish ports; the Grisslehamn-Eckero crossing is about two hours. Arrivals may be at Mariehamn, Eckero or Langnas, so an onward bus, car or taxi might be needed. The tourism travel guide and operator travel page advise matching boat connections to the diving plan. Do not assume Eckero ferry arrivals are dive departures or buy a tight connection before dates are confirmed.

Mariehamn has a year-round Maritime Museum, a seasonal visit aboard Pommern, waterfront walks at the Maritime Quarter and facilities at Mariebad. In summer, non-divers can visit Lilla Holmen, Nabben or Degersand beaches, or choose a sheltered kayak outing in suitable weather. A half-day drive can include Kastelholm Castle or the Bomarsund fortress remains, with seasonal visitor openings. Many of these options remain useful if wind cancels a boat trip. If the group wants to ride together, ask the dive operator directly whether non-diver passengers are allowed and whether the conditions are comfortable for them.

It depends on the actual day and beach. Summer surface water is relatively warmer, but the Baltic has a seasonal risk of cyanobacterial or blue-green algae blooms, often stronger in July and August. The official Baltic monitoring site advises against swimming in water with suspected blooms because some can be toxic. An empty map marker is not proof of clean water: conditions may change within hours. Check beach notices, recent local monitoring, wind and water appearance before entering. If greenish particles, scum or discolored water are present, choose a land-based activity instead.

Before diving, confirm that the boat has emergency oxygen, communications and an evacuation procedure, plus the intended rescue contact. If a serious injury or suspected decompression illness occurs, call 112 first, identify a possible diving injury and follow emergency-service instructions. Aland Central Hospital is in Mariehamn; DAN Europe publishes a secondary diving-emergency number, +39 06 4211 5685, for specialist coordination after local response is activated. Do not assume a recompression chamber is present on the islands, because that capability was not independently verified. Diving insurance should explicitly address the planned depth, technical profile and evacuation needs.