Yttre Adgrund is a shallow reef site located off the southern coast of Finland. Accessible only by boat, this location offers a relaxed environment suitable for beginners, with calm conditions and no current. Divers can expect visibility of approximately 5 metres. Water temperatures fluctuate significantly throughout the year, ranging from 2C in winter to 18C in summer. Due to these conditions, a drysuit or thick wetsuit is recommended during spring and autumn. Divers should remain mindful of their gear configuration and surroundings to avoid potential entanglement risks while navigating the reef structure.

Porkkala Cooking Shed is a shore-accessible dive site in Finland featuring a combination of wreck, reef, and artificial reef structures. The site is suitable for beginners, with depths typically ranging between 6 and 8 metres. Conditions at the site vary, with visibility reported between 3 and 10 metres and mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 2C in late winter to 16C in late summer. Divers should be prepared for cold-water diving environments typical of the region.

Sundsborg is a wreck dive located 2000 metres offshore in the coastal waters of Porkkala, Finland. The wreck lies at depths between 9 and 19 metres, with an average depth of 17 metres. Divers must use a boat to access the site due to strong currents and the distance from shore. Visibility is variable, ranging from 1 to 10 metres, requiring good buoyancy control and torch discipline. The structure presents entanglement risks and sharp edges, necessitating the use of cutting tools. Given the water temperatures, which range from 2°C to 14°C, a well-sealed drysuit is essential for all dives.

Kaivoslampi is a sheltered shore-entry site located in the Helsinki Quarry Dives area. It is suited to new divers building confidence in calm, shallow water. The site is accessible year-round, though conditions and visibility vary, requiring an assessment on the day of the dive. Water temperatures fluctuate significantly throughout the year, ranging from 2°C in winter to 18°C in summer. Divers should use a drysuit or a thick wetsuit with appropriate undergarments, particularly outside of the summer months. Always check locally for current facility availability and conditions before planning a visit.

Ojamo Mine is a flooded industrial site in Finland offering a challenging overhead environment. The dive takes place between 28 and 40 metres, requiring advanced technical and cave diving certification. Divers navigate submerged mine shafts and industrial infrastructure, with visibility typically ranging from 10 to 30 metres. The water temperature remains cold, with a constant 4°C at depth and surface temperatures varying by season. Shore entry is available, with parking and changing rooms provided on-site. Due to the significant depth, decompression requirements, and overhead hazards, this site is strictly for experienced technical divers prepared for cold-water conditions.

The Klaus Oldendorff is a wreck dive located off the coast of Porkkala, Finland. The vessel rests at depths between 22 and 41 metres, requiring intermediate diving skills and cold-water experience. Visibility at the site ranges from 10 to 30 metres, allowing for observation of the wreck structure. Water temperatures are cold, fluctuating between 2 and 12 degrees Celsius, necessitating the use of a drysuit. Divers must manage risks associated with the overhead environment and potential entanglement. Access to the site is by boat only, and divers should remain vigilant for boat traffic when surfacing.

Kammio is a wreck dive site located in the Helsinki Region of Finland. Access to the site is by boat only. Divers can expect depths ranging from 20 to 30 metres, with an average depth of 25 metres. Conditions at the site include moderate currents and visibility typically between 2 and 5 metres. Water temperatures are cold, fluctuating between 1 and 10 degrees Celsius throughout the year. Due to the nature of the wreck, divers must be aware of hazards including entanglement risks, low visibility, and the overhead environment. This site is suitable for intermediate divers. Facilities available include air fills and gear storage.

The MS Coolaroo is a wreck dive located off the southern coast of Helsinki, resting at depths between 20 and 25 metres. Access to the site requires a boat. Divers encounter mild currents and visibility limited to approximately 5 metres, necessitating methodical navigation of the structure. Given the cold water temperatures ranging from 1 to 11 degrees Celsius, a drysuit and thermal undergarments are essential. The site presents hazards including an overhead environment, significant depth, and entanglement risks, requiring advanced buoyancy control and wreck-diving awareness. Typical dive times are around 45 minutes. Ensure all boat charter arrangements are confirmed locally prior to arrival as on-site amenities are not guaranteed.