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.

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.

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.

Pikkala Sand Pit in Porkkala, Finland, is a shallow shore dive site suitable for beginners. The site maintains an average depth of 3 metres. Water temperatures fluctuate significantly throughout the year, ranging from 1°C in February to 18°C in August. Divers should be prepared for mild currents when exploring this location. Shore access is supported by local facilities, including parking and toilets. As a shallow site, it offers a straightforward environment for those looking to practice basic diving skills in a controlled, accessible setting.

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.

The Kronprins Gustaf Adolf is a shipwreck site situated in the Helsinki region, serving as an artificial reef. Divers can explore the wreck at depths ranging from 18 to 21 metres, with an average depth of 20 metres. Access to the site requires a boat, as it is located over 6 kilometres from the shore. Conditions at the site include moderate currents and visibility that fluctuates between 2 and 10 metres. Water temperatures are cold, ranging from 1 to 12 degrees Celsius throughout the year. Due to the environment, divers should be aware of boat traffic, cold water conditions, and low visibility.

The Hval Wreck is a cold-water wreck site located off the coast of Helsinki, Finland. Resting at depths between 20 and 31 metres, this site is suited for intermediate divers. Visibility is typically limited to 5 metres, requiring methodical navigation and the use of a torch to examine structural details. The water temperature remains low, ranging from 1 to 10 degrees Celsius, necessitating the use of a drysuit. Access to the site is by boat only. Divers should remain vigilant regarding boat traffic on the surface and deploy a delayed surface marker buoy for every ascent.

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.